Watermaid WM40 User guide

WM40
Owner's Handbook
PROVEN PERFORMANCE SINCE 1971
POOL CHLORINATION WITH SALT
®
IMPORTANT
PLEASE READ
INSTRUCTIONS
BEFORE USE
For technical service or advice, contact:
AUSTRALIA
Watermaid Pty Ltd
24 Tepko Rd Terrey Hills NSW 2084
Ph: [phone]
Watermaid Pool Chlorinators
91 Carlisle St Ethelton SA 5015
Ph: [phone]
CANADA (Ontario)
Watermaid of Canada Inc.
Ph: [phone]
SOUTH AFRICA (Johannesburg)
Ph: [phone]
USA
Palm Coast, Florida Ph:1 800 876 2027
Kailua, Hawaii Ph:[phone]
AUSTRIA
Ph: [phone]
CANARY ISLANDS
Ph: [phone]
ITALY
Ph: [phone]
MARTINIQUE
Ph: [phone]
SPAIN
Ph: [phone]
SWITZERLAND
Ph: [phone]
THAILAND
Ph: [phone]
MODEL WM40A
for use on swimming pools & spas
Australian Approval SGSEA/100121
Registration No. 28114
Pest Control Products Act (PCPA)
Conforms to: AS3136, UL STD 1081
Certified to: CAN/CSA STD C22.2
NUMBER 218.1 Class 3 Enclosure
N14470
3075239
3075239
®
Copyright © Watermaid Pty Ltd

21
1 STATUTORY RIGHTS OF CONSUMERS
The warranty terms set out below do not
exclude any conditions or warranties which may
be mandatorily implied by law, and your
attention is drawn to the provisions of the
Australian Trade Practices Act, 1974 and the
State legislation which confers certain rights
upon consumers. The following warranty
supplements these.
2. WATERMAID® WARRANTY
(a)WATERMAID PTY LTD warrants to the
WATERMAID® owner that the WATERMAID®
Power Supply (excluding any time clock
component) shall be free of defects in
manufacturing or workmanship for a period of
two (2) years from the date of purchase.
(b)WATERMAID PTY LTD warrants to the
WATERMAID® owner that the time clock
component contained in the WATERMAID®
Power Supply shall be free of defects for a
period of one (1) year from the date of
purchase.
(c)WATERMAID PTY LTD warrants to the
WATERMAID® owner that the WATERMAID®
Cell shall be free of defects in manufacturing or
workmanship for a period of twelve (12)
months from the date of purchase. An
additional forty eight (48) month pro-rata
replacement warranty applies to the
WATERMAID® Cell.
Any parts in the WATERMAID® Power Supply or
Cell found by WATERMAID PTY LTD to be
operationally defective will be repaired or
replaced at WATERMAID PTY LTD's sole
discretion.
d) The WARRANTY as outlined in paragraphs
2(a), 2(b) and 2(c) above DOES NOT apply:-
(i) To any defect or failure caused by misuse,
abuse, abrasion, buildup on Cell electrodes,
electrical faults, power surges (including
lightning strikes), insects, harsh chemicals,
incorrect water balance, wear and tear,
accident, non-observance of installation,
operating and/or cleaning instructions or any
other condition outside of the control of
WATERMAID PTY LTD;
(ii) If the product has been serviced by a
person not authorised to do so by WATERMAID
PTY LTD or with non approved parts;
(iii) If any serial number or compliance label
has been removed or defaced;
(iv) If the product has not been fully paid for
by all parties to the sale or is repossessed
under any financing agreements.
(v) Where the WATERMAID® Power Supply or
Cell has been subject to any use other than
normal domestic pool use. The warranty
applicable to commercial applications is limited
to 12 months from the date of purchase.
3. FREIGHT
Subject to the WATERMAID® owner's statutory
rights referred to in clause 1, WATERMAID PTY
LTD reserves the right to charge for any
services not covered by this warranty,
including freight costs.
4. OTHER LIABILITY
Subject to the WATERMAID® owner's statutory
rights referred to in Clause 1 and 2,
WATERMAID PTY LTD hereby excludes to the
maximum extent permitted by law all other
liability in respect of the product.
5. CLAIMS UNDER WARRANTY
If a defect covered by this warranty arises, the
WATERMAID® owner should contact
WATERMAID PTY LTD as soon as it arises and
advise the nature of the defect. If a repair or
replacement is made under warranty, the
warranty period will not extend past the
original expiration date of the warranty.
6. REPAIRS
For a WATERMAID® Power Supply repaired by
WATERMAID PTY LTD after the warranty period
has expired; a three (3) month defect free
warranty applies to any REPLACED PART. This
warranty excludes any defect or failure caused
by any condition outside the control
WATERMAID PTY LTD.
Effective 1 January 2011. Replaces all undated warranties and warranties dated before 1 January 2011.
®
Copyright © Watermaid Pty Ltd
This Owner's Handbook contains information relating to WATERMAID® salt water chlorinators (as
pictured above) as well as general information on pool maintenance. Please read the SAFETY
INSTRUCTIONS on page 20 before first use.
WM40 Power Supply
(Time clock optional)
The WM40 Power Supply can be coupled to any one of the Cells below:
EZY300 Cell
(40 or 50mm, 1½ or 2”)
Salt Level: 6000ppm
Patented Design
QT300 Cell
(40mm or 1½”)
Salt Level: 6000ppm
XT300 Cell
(50mm or 2”)
Salt Level: 6000ppm
XT400 Cell
(50mm or 2”)
Salt Level: 4000ppm
QT400 Cell
(40mm or 1½”)
Salt Level: 4000ppm
Copyright © Watermaid Pty Ltd
®

20
IMPORTANT SAFETY INSTRUCTIONS
WATERMAID® ELECTROLYTIC CHLORINATOR MODEL WM40LED CHLORINE GENERATING DEVICE
DOMESTIC - FOR RESIDENTIAL POOLS & SPAS
REGISTRATION NUMBER 28114 - PEST CONTROL PRODUCTS ACT (CANADA)
When installing and using this electrical equipment, basic safety precautions should always be
followed, including the following:
READ AND FOLLOW ALL INSTRUCTIONS IN THIS OWNER’S MANUAL AND ON THE LABEL BEFORE
USING.
a) To reduce the risk of electric shock, the ground wire of this device must be connected to the
grounding means provided in the electricity supply service panel with a continuous copper wire
equivalent to the circuit conductors supplying the equipment.
b) WARNING: KEEP OUT OF THE REACH OF CHILDREN.
c) WARNING: Risk of electric shock. Connect only to a grounding type receptacle protected by a
ground fault circuit-interrupter (GFCI). Contact a qualified electrician if you cannot verify that the
receptacle is protected by a GFCI.
d) Do not bury cord. Locate cord to minimise abuse from lawn mowers, hedge trimmers and other
equipment.
e) WARNING: To reduce the risk of electric shock, replace damaged cord immediately. To avoid
hazard, the supply cord, if damaged, must be replaced by the manufacturer or its service agent or
a similarly qualified person.
f) WARNING: To reduce the risk of electric shock, do not use an extension cord to connect unit to
the electricity supply; provide a properly located outlet.
g) CAUTION: to prevent electric shock, switch OFF the power at the electrical power outlet before
dislodging the WATERMAID® Power Supply. Do NOT remove the cover as there are no user
serviceable parts inside. Refer to a qualified service technician for repair.
h) Maintain water chemistry in accordance with manufacturer's instructions. It is recommended
that:
» 25 Kg (55 lb) of magnesium chloride per year be added to the pool.
» NO products containing calcium are to be added to the pool, including granular chlorine.
i) The unit MUST be installed AT LEAST 10 feet (3m) from the inside wall of the pool.
j) Turn OFF the switch on the underside of the WATERMAID® Power Supply when there is no
movement of water through the WATERMAID Cell (e.g. filter backwashing, closed valves and
draining the pool) or while salt is dissolving.
k) Do NOT strike the Cell with any kind of instruments.
l) WARNING: Improper installation or operating the WATERMAID® electrolytic chlorinator model
WM40LED without water flow through the Cell can cause a build up of flammable gases, which can
result in FIRE or EXPLOSION.
Registrant:
Watermaid Pty Ltd
24 Tepko Rd
Terrey Hills NSW 2084
Australia
Ph: [phone]
Canadian Agent:
Watermaid of Canada Inc.
1497 Tenth Sideroad
Tottenham Ontario L0G-1W0
Canada
Ph: 905-936-5593 or 1-877-987-6243
Copyright © Watermaid Pty Ltd
1. Essentials for a healthy pool................................................
a) Filtration................................................................
b) Chlorination............................................................
c) pH.........................................................................
2. Installation.......................................................................
3. The WATERMAID® Power Supply.........................................
4. Auto Cell Cleaning.............................................................
5. The Time Clock..................................................................
6. The WATERMAID® Cell.......................................................
7. Salt Level.........................................................................
8. Running Times..................................................................
9. Zero Chlorine....................................................................
10. The Langelier Index...........................................................
11. Algae...............................................................................
12. Electricity Costs.................................................................
Troubleshooting......................................................................
Important Safety Instructions...................................................
WATERMAID® Warranty...........................................................
2
2
2
3
4
9
10
10
10
13
13
14
15
16
17
18
20
21
CONTENTS
Copyright © Watermaid Pty Ltd

19
CHLORINE RESIDUAL LOW OR NIL
* Not enough chlorine being produced
* Insufficient running times and/or heavy bather load
* Insufficient chlorine stabiliser level and/or strong sunlight conditions
* pH too high or low
* Poor circulation [refer below]
* Algacide has been added within the last 4 weeks
* Excessive calcium inhibiting chlorine production
* Cell is old and needs replacing
NO LIGHTS AT ALL
* No power to WATERMAID® Power Supply
* Time clock incorrectly set or faulty
* Problem inside WATERMAID® Power Supply - refer to qualified service technician for repair
SCALE BUILD-UP ON CELL ELECTRODES [refer to section 6]
* Excessive calcium level in water
* Insufficient magnesium in water
PH ALTERS RAPIDLY AND EASILY
* Low total alkalinity in marblesheen, pebbled, quartzon or tiled pools and may be the result of
contamination [e.g. debris, urine, surrounding vegetation etc]
POOR CIRCULATION
* Dirty and/or clogged filter
* Skimmer baskets full and require emptying
* Faulty pump
* Low speed pump
* Water level is low
* Cell is clogged with scale
FILTER PROBLEM
If the WATERMAID® chlorinator is capable of registering 75 - 100%, but the pool water is cloudy, there
may be a filter problem.
* The filter may need backwashing
* Longer running times of the pool equipment may be required
* Sand filters: The sand in a sand filter should be replaced every 5 years
* Diatomaceous Earth (D.E.) filters: The pads may need changing
(Continued)
TROUBLESHOOTING
Copyright © Watermaid Pty Ltd
2
1. ESSENTIALS FOR A HEALTHY POOL
The recommended daily levels for swimming pools and spas as determined by a test kit are given in the
table below. Check the expiry date on the test kit, as test results may be inaccurate if used after that
date.
There are three fundamental requirements for maintaining a swimming pool or spa: a) Filtration, b)
Chlorination and c) pH. A pool should be looked at daily to check that the water is clean and clear and
the finest details of the walls can be seen at the deepest part. This will indicate whether the pool has had
enough filtration and chlorination for the load conditions that were applicable the day before. Any other
condition requires testing and rectification before entering the water.
a) FILTRATION
It is first necessary to pass water through a filter to remove debris. A standard sized pool pump with
normal filter pressures will pump about 10,000 litres (2,642 gal) an hour, so an average 60,000 litre
(15,850 gal) pool then requires six to ten hours of filtration a day in summer conditions. This will turn
over the equivalent of 1½ times the total volume of water. However, about 65% only of the actual
water and debris will have passed through the filter. For spas, the water usually turns over several
times per hour.
b) CHLORINATION
The WATERMAID® pool chlorinator takes care of the chlorination. As mild saline water flows through the
WATERMAID® Cell, it is converted by electrolysis into chlorine as sodium hypochlorite. Chlorine is
required after filtration to react with any remaining debris (both visible and invisible), remove stains by
oxidation and sterilise the water of harmful bacteria.
A chlorine residual (or reserve) is required for any imminent bather load. A total of 1 to 3 ppm for pools
and 3 to 5 ppm for spas of free available chlorine is required to maintain a clean clear condition.
Because of its instability, chlorine has a half-life of some 35 minutes in strong sunlight and even less in
the presence of contaminants. Therefore, the use of a chlorine stabiliser is strongly recommended
as it lengthens the half-life of chlorine to about 140 minutes and helps maintain a chlorine residual in the
pool on hot sunny days. At the beginning of the summer season, chlorine stabiliser (iso-cyanuric acid)
should be added to the pool.
Generally, at dawn and at dusk, any wind will die down, which
are the best times to commence filtration. Leaves and floating
debris will be swept to the skimmer box without restriction if
the pool is well designed.
Longer filtration cycles can reduce the chlorine
requirement and conversely, more chlorine can reduce
the filtration requirement.
For an average 60,000 litre (15,850 gal) pool, add 2½ Kgs
(approx. 6 lb) of chlorine stabiliser. After this initial dose, the
pool should be topped up with chlorine stabiliser throughout the
hot summer period to maintain a level between 30 and 50 ppm.
Factors such as sunlight, filter and pump efficiency, stabiliser
level, bather load, debris, water temperature, salt level, water
level, chemical balance and age of the Cell, ALL affect the final
chlorine level.
FILTER & PUMP
60,000L
or
15,850 gal
10,000 L / hr
2,642 gal / hr
6 - 10 hours / day
Free Available Chlorine (ppm)
pH
Total Alkalinity (ppm)
Pools
1.0 - 3.0
7.2 - 7.8
100 - 200
Spas
3.0 - 5.0
7.2 - 7.8
100 - 200
Recommended chlorine
stabiliser level: 30 - 50 ppm
Do NOT exceed 80 ppm
Copyright © Watermaid Pty Ltd
Note: Indoor pools do
not require the addition
of chlorine stabiliser.
Nor do spas due to the
high turnover rate of
the water.

3
c) pH
pH is a measure of the concentration of hydrogen ions in a solution, or in simpler terms the acidity or
alkalinity of a solution. A solution with pH of 7 is neutral. A solution with pH below 7 is acidic and a
solution with pH above 7 is alkaline.
By electrolysis, the WATERMAID® Cell produces sodium hypochlorite (NaOCl), which in water
dissociates into sodium (Na+) and hypochlorite (OCl-) ions. It is the hypochlorite ions that then form
with the hydrogen (H+) ions (from the water) to form hypochlorous acid (HOCl), the active agent
that destroys bacteria and algae, and oxidizes organic matter.
The chart (below) shows the effect of pH on the reversing reaction of HOCl in water. The greater the
percentage of active HOCl molecules in the water, the better the sanitising effect. From the chart, it can
be seen that at pH between 3 and 7, the percentage of active HOCl molecules in the water is at its
highest, although it is not suitable for swimming because the water is acidic.
Marblesheen, pebbled, quartzon and tiled pools stabilise naturally between pH 7.6 and 8.2 so
the effects of chlorine are disadvantaged. For these pools it is recommended that pH buffer
(sodium bicarbonate) be used as this will help stabilise the pH between 7.6 and 7.8, as well as raise
the total alkalinity.
Total alkalinity is a measure of the alkaline chemicals in the water such as bicarbonates and carbonates.
It affects the speed and ease of pH change. If the total alkalinity is too high, keeping the pH within the
desired range is difficult. Keeping the total alkalinity between 150 and 200 ppm will help keep
the pH below 7.8.
Adding sodium bicarbonate will also help to protect newly-surfaced marblesheen, pebbled, quartzon and
tiled pools, as it will react with calcium salts and form a coating of calcium carbonate over the surface.
This in turn will slow down the leaching out of lime from the fresh cement (which contains up to 60%
calcium oxides), thereby making it easier to achieve the desired water balance.
For an average sized pool, about 10 Kg (approx. 22 lb) of sodium bicarbonate will raise the total
alkalinity 80 ppm.
The pH remains stable and within the required range for pools with inert surfaces such as
fibreglass, fibreglassed concrete, painted concrete and vinyl-lined surfaces, which also have
a naturally occurring total alkalinity of 80 - 100 ppm. As this is an ideal situation, there is no
need to add pH buffer to these pools.
If hydrochloric acid is to be used to lower pH, it should be added SPARINGLY and only according to the
instructions given by an ACID DEMAND Test Kit. Any excess acid will attack the pool walls causing
calcium to be released into the water, which will then build up on the electrodes.
The ideal pH range for swimming
conditions is between 7.2 and 7.8.
It is important to note from the chart that
at pH 8.0, the chlorine in the water will
only be 21% effective.
A pH above or below the ideal range can
also cause irritation to the eyes and skin.
Ideal Range
7.2 - 7.8
Acid Neutral Alkaline
pH SCALE
Total % of ACTIVE HOCl molecules
Total % of non-active OCl ions
THE EFFECT OF pH
ON HYPOCHLOROUS ACID
pH
1 2 3 4 5 6 7 8 9
0
20
40
60
80
100
100
80
60
40
20
0
Copyright © Watermaid Pty Ltd
18
TROUBLESHOOTING
LIGHTS DISPLAYED
Copyright © Watermaid Pty Ltd
100% CHLORINE PRODUCTION
LOW RANGE CHLORINE PRODUCTION
* Winter time / cold water temperature
* Low salt level
* Build up on cell electrodes
* Cell electrodes worn out
FLASHING BLUE LIGHT -AUTO CLEAN MODE
* Factory preset to 5 min / hour, after the first hour
SOLID RED LIGHT
* Salt level above recommended level and/or hot water
temperature in the pool. To rectify, when all lights light up,
press the minus ("-") button 2 - 3 times, so that the
WATERMAID® is not running at 100%.
* Check there is no metal contact between the 2 electrodes.
FLASHING RED LIGHT
* Water flow problem.
* Gas sensor error. Check sensing tang is clean and free of
deposit; the white wire is connected inside the black junction
box properly (metal to metal); and that the white wire is not
water damaged or affected by corrosion.
FLASHING AMBER LIGHT
* The red & black Cell wires are either matched incorrectly
inside the junction box or water damaged / affected by
corrosion.
* There is a break in the black wire.
* After heavy rain, a layer of rain water, which is less dense
and contains little salt will be at the top and feeding into the
electrolytic Cell.
* No load (Cell dead).
* Standby mode - press the plus ("+") button to make a
selection.
FLASHING RED & AMBER LIGHTS IN SEQUENCE
* There is a break in the red wire.
Red Amber Amber Amber Green Green Green Green Green Blue
DISPLAY LIGHTS - LAYOUT

4
2. INSTALLATION
The WATERMAID® chlorinator may be installed by the pool owner (Australian and European models
only). However, these instructions should be fully understood to ensure correct installation and safe
operation. Incorrect installation may pose a danger and/or may damage the unit thus voiding warranty.
If there is any doubt, then an experienced pool technician or plumber should carry out the installation.
US and Canadian models will require a qualified electrician to hard wire the chlorinator to run
inconjunction with the pump.
(i) MEASURE THE POOL
The QT300, XT300 and EZ300 Cells are designed to operate with a salt level of 6000ppm.
If there is NO salt in the pool, the amount of salt required is worked out by the following calculation:
SALT REQUIRED (Kg) = POOL VOLUME (L) x 0.006 or
SALT REQUIRED (lb) = POOL VOLUME (gal) x 0.006 x 8.3453
The QT400 and XT400 Cells are designed to operate with a salt level of 4000ppm.
If there is NO salt in the pool, the amount of salt required is worked out by the following calculation:
SALT REQUIRED (Kg) = POOL VOLUME (L) x 0.004 or
SALT REQUIRED (lb) = POOL VOLUME (gal) x 0.004 x 8.3453
For a pool that already has salt in it, calculate:
SALT REQUIRED = (DESIRED SALT LEVEL - SALT LEVEL ALREADY IN POOL) x POOL VOLUME (L)
where ppm is "parts per million". Eg: 6,000ppm = 6,000 / 1,000,000 = 0.006
(ii) ADDING SALT
Empty the contents of the required salt bags into the shallow end. Run the filter and pump
simultaneously to circulate the water and dissolve the salt. If the WATERMAID® chlorinator has already
been installed, the switch underneath the should be turned OFF while salt is dissolving.
Quality pool salt (with low levels of iron and other impurities) should be used. Finer grades dissolve
faster. Salt may take 24 - 48 hours to dissolve in summer and longer in winter. Alternatively,
sea water may be used. The salt bag should NOT be thrown into the pool as chemicals and inks can
interfere with the water balance.
If the pool has no main drain, place a vacuum hose head in the deep end, and sweep the salt toward
the vacuum head. The other end of the vacuum hose should be placed in the skimmer box. Run the
filter and pump with the Cell "On/Off" switch OFF to circulate the undissolved salt in the water.
WARNING: Never add chemicals directly to the skimmer basket as this may damage the Cell.
The size of a pool determines the amount of salt
to add. If the pool shape is rectangular, then the
length, breadth and average depth are
multiplied. If the pool has an irregular shape,
then the average of the measurements can be
taken.
Pools that have used liquid chlorine for many
years prior to having a WATERMAID®
chlorinator may already have a significant salt
level in the water. It is advisable to check the
salt level before adding salt. This can be done by
either using a WATERMAID® hydrometer or
taking a sample of water to a pool shop.
Average
Depth = 1.5M
Breadth = 4.5M
Length = 9M
One bag of salt usually
contains 25 Kg or 40 lb.
Average Pool
10 x 4 x 1.5 m
=60,000 litres or 60 m³
or
30 x 15 x 4 feet x 6.25
=12,000 gallons
Copyright © Watermaid Pty Ltd
4. Floc the pool with a clarifier. After a few hours, a blanket of debris will settle on the pool floor
and can then be vacuumed directly to waste (i.e. NOT through the filter). The switch underneath the
WATERMAID® Power Supply should be turned OFF while vacuuming to waste. Following this,
the pool should gradually attain a clean, clear condition after constant filtration and chlorination.
5. Finally, the use of lanthanum carbonate (or "Starver") is recommended to reduce the
phosphorous content to less than 1 part per billion. This starves algae of an essential element for
growth.
As a guide, the WATERMAID® chlorinator may need to be run non-stop for several days to overcome
the addition of an algaecide. Otherwise, a sufficient chlorine reading may be impossible to obtain for up
to four (4) weeks.
For spas, it is often best to drain, clean and refill. Follow the manufacturer’s recommended procedure.
12. ELECTRICITY COSTS
When an Australian 240VAC model WATERMAID® chlorinator is running at full capacity, it is using 300
watts of power.
{POWER (watts) = VOLTS X AMPS}
Therefore the cost to run a WATERMAID® chlorinator at full capacity is worked out using the following
formula:
COST = No. of x Hours x Cost Per
TO Watts Run kWh
RUN
1000
For example, to run a WATERMAID® WM40 chlorinator for 10 hours per day during off peak hours,
where the off peak rate of electricity is 8.8 cents/kWh, the electricity cost will be:
= 300 (Watts) ÷ 1000 x 10 (Hours) x 8.8 (kWh)
= 26.4 c / day
Off Peak Hours = 10pm - 7am, 7 days
17 Copyright © Watermaid Pty Ltd

16
The ideal environment for algal growth is when there
are periods of zero chlorine. Algae blooms can take
less than a day to turn a pool green.
At the first sign of adversity, the algae population goes
into a reproduction phase to produce spores. The size
of these spores is less than 0.2 microns. D.E. filters
are able to filter 5+ microns and sand filters are only
able to filter 20+ microns.
11. ALGAE
A common problem for any type of pool is algae growth. There are 24,000 known types of algae, all
distinguishable by being single-celled organisms capable of photosynthesis (they produce their own
food), mitosis (all cells can divide) and meiosis (reproduction is possible by combining with other algal
cells).
Algae will die from doses of chlorine as low as 0.05 ppm concentration, but spores can resist chlorine
levels up to 10 ppm. Domestic salt chlorinators cannot achieve such a level.
Spores, however, cannot tolerate copper salts as copper attaches to the shell or endospore
preventing germination. Hence, the most effective algaecides contain copper salts.
For a few black algal spots, suspending 50 grams (1.7 ounces) of stabilised chlorine in a weighted nylon
bag over the trouble spots may remove them.
For a more serious algae problem, it is advisable to follow the procedure below:
1. Lower pH below 7, generally by the addition of up to 2 litres (4 pt) of pool acid, as this is an
essential part of reducing algae resistance.
2. About 4 hours later, add a copper treatment to attain a 1 ppm copper level in the pool. One
economical method is to mix about 1 heaped tablespoon of copper sulphate (approximately 70 grams or
3 ounces) dissolved in 10 litres (approximately 3 gal) of water spread around the pool. But the use of
any commercial copper-based algaecide will do.
Note: Do not swim in the pool for at least 24 hours, as the copper treatment may discolour
hair and clothing.
3. After about 12 hours, a stainless steel brush and a garden hose fitted with a brass jet gurney
(available from hardware stores) can be used to remove algae from the pool walls.
TO LOWER TOTAL ALKALINITY
USING LIQUID POOL ACID
(HYDROCHLORIC ACID)
50,000
395mL
580mL
1.22L
1.60L
2.00L
2.40L
2.82L
3.20L
3.60L
4.05L
75,000
554mL
1.20L
1.85L
2.40L
3.05L
3.65L
4.25L
4.85L
5.45L
6.10L
100,000
790mL
1.60L
2.45L
3.20L
4.00L
4.80L
5.65L
6.40L
7.20L
8.10L
Table A
POOL VOLUME IN LITRES
TO RAISE TOTAL ALKALINITY
USING SODIUM BICARBONATE
INCREASE
ppm
10
20
30
40
50
60
70
80
90
100
50,000
893gm
1.70Kg
2.60Kg
3.40Kg
4.30Kg
5.20Kg
6.00Kg
6.80Kg
7.80Kg
9.00Kg
75,000
1.34Kg
2.60Kg
3.90Kg
5.20Kg
6.50Kg
7.80Kg
9.10Kg
10.40Kg
11.70Kg
13.40Kg
100,000
1.79Kg
3.40Kg
5.20Kg
6.80Kg
8.60Kg
10.40Kg
12.00Kg
13.60Kg
15.60Kg
18.00Kg
Table B
POOL VOLUME IN LITRES
LOWER
ppm
10
20
30
40
50
60
70
80
90
100
U.S.
Measurement
Conversions:
To convert from
Litres to Gallons:
x 0.2642
To convert
from Kilograms
to Pounds:
x 2.205
A microscopic view of algae
Copyright © Watermaid Pty Ltd 5
(iii) MOUNT THE WATERMAID® POWER SUPPLY
The WATERMAID® Power Supply MUST be installed AT LEAST 3M (10 ft) from the inside wall of the
pool. Ideally it should be enclosed within a splash-proof housing (e.g. filter box) and mounted in a
position that complies with local regulations.
1. Locate a suitable position for the WATERMAID® Power Supply which allows for box dimensions of 240
mm wide x 320 mm high x 130 mm deep (9.4 x 12.6 x 5.1 ins. respectively). [Leave a gap of at least
20 mm (0.8 ins.) at the top of the WATERMAID® Power Supply to any structure or fitting above].
2. For mounting onto brick work:
a) Drill two 8 mm (0.3 in) diameter holes, 30 mm (1.2 in) deep, that are 156 mm (6.1 in) apart and
level.
b) Insert two 8 mm (0.3 in) diameter wall plugs into the holes drilled.
c) Place the screws (provided) into the holes of the bracket (provided) and tighten.
3. For mounting onto timber:
a) Drill two 4 mm (0.2 in) diameter holes into the timber, 30mm (1.2 in) deep, that are 156 mm (6.1
in) apart and level.
b) Place the screws (provided) into the holes of the bracket (provided) and tighten.
4. Lift the WATERMAID® Power Supply onto the bracket ensuring that it is secure on the wall.
N.B: The appliance must be installed such that the supply plug is accessible.
(iv) INSTALL THE WATERMAID® CELL
Before installing the Cell, unplug the pump and WATERMAID® Power Supply. This is advisable so that
the filter will not start inadvertently if a time clock already exists. Also, close off any valves if the filter
and pump are below pool surface level or if there are no valves, block off the inlet and outlet with
rubber stoppers. The WATERMAID® Cell should then be installed as per the model-relevant installation
diagram given on page 6, 7 or 8.
(v) ATTACH THE CELL TO POWER SUPPLY
If the wires are connected incorrectly, the unit may appear to work for a brief period but may damage
the Cell and Power Supply if left uncorrected.
(vi) CONNECT TO THE POWER OUTLET
Australian and European models: [refer to diagram below]
1. Insert the pump plug into the socket at the base of the WATERMAID® Power Supply.
2. For a time clock Power Supply, insert the WATERMAID® plug into the electrical power outlet.
3. For a non time clock Power Supply, insert the WATERMAID® plug into an external time clock and plug
the time clock into the electrical power outlet.
US and Canadian models:
1. For 110VAC models, insert the WATERMAID® Power Supply's plug into the electrical power outlet.
The outlet must be wired by a qualified electrician so that no power is available to the unit if the pump
is off.
2. For 220VAC models, the WATERMAID® Power Supply’s power cord should be hard wired by a
qualified technician to run in conjunction with the pump.
If the Cell and Power Supply are not already connected,
use a screwdriver to connect the Cell wires to the wires
contained in the black junction box at the base of the
WATERMAID® Power Supply as follows:
Red or Brown - TO - Red or Brown
Black or Blue - TO - Black or Blue
White - TO - White
PUMP
TIME CLOCK POWER SUPPLY
STANDARD
POWER SUPPLY
EXTERNAL
TIME CLOCK
Cell cord
White wire
Black/Blue wire
White wire
Holding
Clamp
Red/Brown wire
Red/Brown wire Black/Blue wire
Copyright © Watermaid Pty Ltd
POWER
OUTLET

15
* If the result is between -0.2 and +0.2, then the pool water is in
balance.
* If the result is lower than -0.2, then the pool water is corrosive.
* If the result is higher than +0.2, then the pool water is
scale-forming.
LANGELIER INDEX CALCULATION TABLE
---------------------------------------------------------------------------------
32.0
37.4
46.4
53.6
59.0
66.2
75.2
84.2
93.2
104.0
127.4
Pool Water
Temperature
(°C) (°F)
Temp
Factor
(TF)
Calcium
Hardness
as CaCO
³
Hardness
Factor
(HF)
Total
Alkalinity
as CO
³
Alkalinity
Factor
(AF)
0
3
8
12
15
19
24
29
34
40
53
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
5
25
50
75
100
150
200
300
400
800
1000
0.3
1.0
1.3
1.5
1.6
1.8
1.9
2.1
2.2
2.5
2.6
5
25
50
75
100
150
200
300
400
800
1000
0.7
1.4
1.7
1.9
2.0
2.2
2.3
2.5
2.6
2.9
3.0
10. THE LANGELIER INDEX
The Langelier Index calculation table (below) can be used to check the water balance of a pool.
Readings of pH, water temperature, calcium hardness and total alkalinity are needed. These readings
are used to obtain the corresponding factor readings from the table (below) and then, to perform the
Langelier Index calculation.Add the pH, TF, HF and AF together. Then subtract 12.1 (K, a constant) to
give the Langelier Index reading.
For example, if pool water had the following values; pH 7.4, temperature 24°C (or 75.2°F), calcium
hardness 100 ppm, and total alkalinity 200 ppm, then the Langelier Index calculation would be worked
out as follows:
Start with pH
Add TF
Add HF
Add AF
Subtract (K=12.1)
Langelier Index =
To rectify corrosive water, the total alkalinity will need to be raised by adding sodium bicarbonate (Table
B, next page).
To rectify scale-forming water, the total alkalinity will need to be lowered by adding hydrochloric acid
(Table A, next page).
Please note: the use of sodium bicarbonate in an inert-surfaced pool (fibreglass, fibreglassed
concrete, painted concrete or vinyl-lined) is simply a waste of chemicals. The unchanging calcium
level means that the total alkalinity becomes a function of pH and water temperature and will then find
its own equilibrium with time.
The ideal water balance is:
* Water temperature of 15°C - 30°C (59°F - 86°F)
* Calcium level of 60 - 120 ppm
* Magnesium level of greater than 20 ppm
* Iso-cyanuric acid level 30 - 50 ppm
* Total alkalinity >150 ppm
* pH 7.4 - 7.8 for quartzon, marblesheen, pebble or tiled pools or 7.0 - 7.6 for fibreglass, painted
concrete or vinyl-lined pools.
To maintain water in balance for marblesheen, pebbled, quartzon and tiled pools, the total alkalinity
should be greater than 150 ppm if the pH is to be kept below 7.8. Consult tables A and B (next
page) to achieve the correct total alkalinity.
+7.4
+0.6
+1.6
+2.3
-12.1
-0.2
Copyright © Watermaid Pty Ltd
6
Copyright © Watermaid Pty Ltd
WATERMAID® QT & XT SERIES CELL - VERTICAL INSTALLATION DIAGRAM
IMPORTANT: * For QT & XT Cells, a GAS TRAP must be installed to prevent the accumulation of hydrogen gas in the filter if the
pump ever fails (refer to diagram below).
* The Cell must be installed so that ALL the water from the filter passes through the Cell BEFORE any diversions or breakouts to devices such as dual outlets, spa lines and pressure type cleaners. * The Cell must be installed AFTER any heater and a distance of AT LEAST 1.5M (4.9 ft) away from the heater, as per the configuration below, otherwise distortion to the Cell casing may occur. * Use TYPE P PRESSURE SOLVENT CEMENT (glue). * Ensure the SENSING TANG is positioned at the HIGHEST POINT. * WARNING: Improper installation or operating the WATERMAID® electrolytic chlorinator model WM40 without water flow through the Cell can cause a build up of flammable gases, which can result in FIRE or EXPLOSION.
25%
50%
75%
100%
CHECK *WATERFLOW *CELLCONNECTION
CHECK *SALTLEVEL *CELL
AUTO
CELL
CLEAN
PRESS PRESS
FILTER
HEATER
PUMP
CELL
TO POOL
FROM POOL
PROVENPERFORMANCE SINCE 1971
POOL CHLORINATION WITH SALT
GAS TRAP
SENSING TANG

14
The only way to determine the needs of the pool when varying the operating times between seasons is
to monitor the pool daily and make adjustments accordingly. The overall aim of sufficient running times,
operation during bather hours and superchlorination is to produce a chlorine reading of 1 - 3 ppm. The
finest detail must be discernible at the bottom of the deep end of the pool.
Public Pools may require multiple chlorinators, pumps and filters, as well as 24-hour operation of the
pool equipment. A "rule of thumb" is 1 Kg (2.2 lb) of 100% available chlorine per 20 bather hours (2
people/10 hrs etc).
Running times for spas is dependent on the bather load of the spa. Initial daily testing will help to
determine the required running times. The overall aim of sufficient running times and operation during
bather hours is to produce a chlorine reading of 3 - 5 ppm.
9. ZERO CHLORINE
If the recommended residual chlorine level cannot be obtained, check the following:
(a) If an algaecide has been added in the last 4 weeks. Most algacides contain ammonium compounds
(approximately 20%), which will react with chlorine to leave a zero chlorine reading in the water. As a
guide, about NINE times the amount of ammonium compound IN CHLORINE will need to be produced or
added before there is a free chlorine level in the water. Any debris in the water will need ADDITIONAL
chlorination.
(b) If the filter is functioning properly. Take a sample of pool water in a clear glass and hold it up to the
light. Floating debris will indicate that unfiltered water is getting back into the pool. If the filter is not
functioning properly, there will not be enough chlorine in the water to cope with the debris.
It is important to note that the sand in a sand filter should be changed roughly every 5 years as the
edges become rounded over time due to the constant abrasion during filtering and will not work as
effectively.
(c) The bather load. With sufficient running times, the WATERMAID® chlorinator should be able to
maintain a clean clear pool for about a 20 bather/hour ratio (e.g. 4 people/5 hrs, 10 people/2 hours
etc). It is important to note that contamination from sunscreen, urine and pets will dramatically destroy
the chlorine.
(d) Incorrect pH. Chlorine is not as effective outside the correct pH range. Refer to chart, section 1(c).
14
12
10
8
6
4
2
Winter Spring Summer Autumn
Hours
SUGGESTED RUNNING TIMES
(average-sized domestic pool)
PLEASE NOTE:
If a solar heater is installed and
running times are set for
chlorination and filtration in the
daytime, then extra chlorination in
non-sunlight hours may be
required.
On a monthly basis in summer the
WATERMAID® chlorinator, filter
and pump should be run non-stop
for at least 24 hours to super
chlorinate and maintain a high
polish in the pool.
Copyright © Watermaid Pty Ltd
7
Copyright © Watermaid Pty Ltd
WATERMAID® QT & XT SERIES CELLS - HORIZONTAL INSTALLATION DIAGRAM
IMPORTANT: * For QT and XT Cells, a GAS TRAP must be installed to prevent the accumulation of hydrogen gas in the filter if the pump ever fails. * The Cell must be installed so that ALL the water from the filter passes through the Cell BEFORE any diversions or breakouts to devices such as dual outlets, spa lines and pressure type cleaners. * The Cell must be installed AFTER any heater and a distance of AT LEAST 1.5M (4.9 ft) away from the heater, as per the configuration below, otherwise distortion to the Cell casing may occur. * Use TYPE P PRESSURE SOLVENT CEMENT (glue). * Ensure SENSING GANG is positioned at the HIGHEST POINT. * WARNING: Improper installation or operating the WATERMAID® electrolytic chlorinator model WM40 without water flow through the Cell can cause a build up of flammable gases, which can result in FIRE of EXPLOSION.
FILTER
HEATER
PUMP
TO POOL
FROM POOL
25%
50%
75%
100%
CHECK *WATER FLOW *CELL CONNECTION
CHECK *SALT LEVEL *CELL
AUTO
CELL
CLEAN
PRESS PRESS
PROVENPERFORMANCE SINCE 1971
POOL CHLORINATION WITH SALT
GAS TRAP
CELL
SENSING TANG

13
Poor water flow, overheating, and heavily encrusted electrodes allow chlorine gas to etch the titanium
base and cause the precious coating to shed. Such conditions VOID WARRANTY. Obvious signs of these
conditions are a change in colour of the anode mesh and a whitening of the Cell casing.
To check Cell performance, place the Cell in a 25 litre (6.6 gal) bucket of pool water at 20°C (68°F) with
6000 ppm of salt. The dome section of EZ300 Cells should NOT be submersed. The Cell should produce a
1 ppm chlorine reading within 5 seconds. If the Cell fails this test and it has been cleaned, then a new
Cell may be needed.
(vi) NO WATER FLOW AND THE CELL
If there is no movement of water through the WATERMAID® Cell (e.g. in the case of blocked skimmers,
closed valves, draining of the pool or during backwashing) while the WATERMAID® Power Supply is
switched on, then hydrogen gas can build up, heat may generate and the Cell casing may expand, distort
and turn white, until the gas sensor switches the power off. This practice is NOT recommended, nor
covered by warranty.
When there is no water flow through the WATERMAID® Cell, the power to the Cell should be
switched OFF via the switch on the underside of the WATERMAID® Power Supply.
7. SALT LEVEL
At the beginning of the swimming season, the salt level should be checked to ensure that it is correct.
6000 ppm (0.6 %) for WATERMAID® QT300, XT300 and EZ300 Cells.
4000 ppm (0.4%) for WATERMAID® QT400 and XT400 Cells.
Each year, approximately one-third of pool water is lost, so the salt level will need to be adjusted
accordingly. Refer to section 2(i) for calculating how much salt to add.
Salt is NOT lost by the process of electrolysis, nor when water evaporates. It is lost, only in the following
ways:
1. Backwashing - after 20 backwashes approximately 1 bag of salt is lost.
2. Pool overflow (rainfall, flooding etc).
3. Splash out from bathers.
4. A leak in the pool or plumbing.
To reduce the amount of salt lost by backwashing for long periods of time, place the garden hose, turned
on full, into the skimmer box during backwashing.
A salt level of 9000 ppm is isotonic with body tissue, and in the case of accidental immersion,
water at close to this level will cause less damage to lungs and other body organs than water
without salt.
8. RUNNING TIMES
Ideally, the time clock should be set to operate the WATERMAID® chlorinator from late afternoon (when
the sun is off the pool) to continue throughout the night as necessary. As UV rays destroy chlorine, a
chlorine stabiliser is recommended during summer for outdoor pools [refer to section 1(b)].
Suggested running times for an average-sized domestic pool are shown in the chart (next page). Please
note: during summer, between 8 and 14 hours per day is recommended.
Running times will depend on pool volume, bather load, water temperature, time of year, pump
efficiency, salt level, Cell age and condition, cyanuric acid levels, pH, sunlight, water chemistry and the
effects of surrounding vegetation.
In addition to normal running hours, the WATERMAID® chlorinator, pump and filter should be
run whenever bathers are in the pool.
Copyright © Watermaid Pty Ltd
8
Copyright © Watermaid Pty Ltd
TO POOL
IMPORTANT: * The Cell must be installed so that ALL the water from the filter
passes through the Cell BEFORE any diversions or breakouts to devices such as dual outlets, spa lines, and pressure type cleaners. * The Cell must be installed AFTER any heater and a distance of AT LEAST 1.5M (4.9 ft) away from the heater, as per the configuration below, otherwise distortion to the Cell casing may occur. * EZ300 Cells incorporate a gas trap in their vertical design. * Use TYPE P PRESSURE SOLVENT CEMENT (glue). * Ensure the SENSING TANG is positioned at the HIGHEST POINT. * WARNING: Improper installation or operating the WATERMAID® electrolytic chlorinator model WM40 without water flow through the Cell can cause a build up of flammable gases which can result in FIRE or EXPLOSION.
WATERMAID® EZ300 CELL - INSTALLATION DIAGRAM
FILTER
HEATER
PUMP
FROM POOL
25%
50%
75%
100%
CHECK *WATER FLOW *CELL CONNECTION
CHECK *SALT LEVEL *CELL
AUTO
CELL
CLEAN
PRESS PRESS
PROVENPERFORMANCE SINCE 1971
POOL CHLORINATION WITH SALT
EZ300 PARTS VIEW
ASSEMBLY: 1. Insert Venturi Vane into T-Piece. 2. Align bottom of Cell Housing with top of T-Piece and screw Barrel Nut tight (ensure O'Ring is in place). 3. Insert Cathode into Cell Housing and position Locating Spacer into Venturi Vane. 4. Place Cell Barrel Nut over dome top of Cell Cathode. Position Brass Socket above Resined Pot and screw Cell Barrel Nut tight. 5. Insert Brass Plug into Brass Socket.
Cell Cable to
Power Supply
Brass Plug
Brass Socket
Cell Barrel Nut
O’Ring
Cathode (Removable)
Locating Spacer
Venturi Vane
Resined Pot
Cell Housing & Anode
O’Ring
T-Piece Barrel Nut
T-Piece SENSING
TANG
CELL

9
3. THE WATERMAID® POWER SUPPLY
The Chlorine Production Scale (pictured below) on the WATERMAID® Power Supply indicates how much
chlorine per hour the unit is producing.
At 100%, the WATERMAID® is producing 30 grams per hour of 100% available chlorine, shown by 3
amber AND 5 green solid lights simultaneously (see below).
The "+" and "-" buttons on the scale can be used to increase or decrease chlorine production. However,
chlorine production is dependent on the salt level AND water temperature. If the salt level or
water temperature are low, then less chlorine is produced.
At 6000 ppm salt and 20°C (68°F) water temperature, the QT300, XT300 and EZ300 Cells should run at
100%.
At 4000 ppm salt and 20°C (68°F) water temperature, the QT400 and XT400 Cells should run at 100%.
Areas with a hotter climate may have water temperatures around 30°C (86°F), in which case a salt level
not exceeding 4000 ppm is recommended.
For a full explanation of the trouble lights on the WATERMAID® Power Supply, please refer to the
troubleshooting section at the back of this handbook.
THE INTEGRATED CIRCUIT BREAKER/ROCKER SWITCH
If the Power Supply needs to be reactivated in the event of current overloading or a power surge to the
primary side, the switch on the underside of the WATERMAID® Power Supply will need to be turned ON
again.
It is recommended that this switch be turned OFF when dissolving salt, backwashing the filter, draining
the pool or there is no water flow through the Cell.
POWER OUTLET (Australian and European models only)
The power outlet on the underside of the WATERMAID® Power Supply is designed to power ONE pool
pump only.
This power outlet is rated to a MAXIMUM rating of 10 Amps and should NOT be overloaded with more
than one device. Exceeding the outlet rating is not covered by warranty.
+
* HIGH SALT LEVEL
* WATER FLOW
* GAS SENSOR
* LOW SALT LEVEL
* LOW WATER TEMP
* CHECK CELL
AUTO
CELL
CLEAN
Copyright © Watermaid Pty Ltd
12
3. A dilute acid solution prepared according to the following procedure may be used:
i) In a glass or strong plastic container, add 1,000 mL (2.1 pt) of hot (not boiling) water.
ii) THEN add 100 mL (3.4 fl.oz) hydrochloric acid to the water.
iii) QT and XT series Cells can either be submersed in the solution or the solution can be poured into the
Cell after one end of the Cell is blocked. One end may be blocked by using a WATERMAID® cleaning cap
and barrel nut.
For EZ300 Cells, turn Cell upside-down (since one end is blocked already) and pour the solution inside.
Avoid submersion of the brass plug and socket.
The mixture may effervesce for several hours, and thereafter should be discarded. If the scale is
stubborn, step 3 may need to be repeated with a new solution.
Alternatively, white vinegar (without dilution) or a PHOSPHATE-FREE premixed "Cell-Cleaning Solution"
(available from a pool shop) may be used.
4.
Rinse the electrodes with tap water.
5. Return the Cell to pipe-work ensuring not to overtighten the barrel unions.
IMPORTANT:
* The sensing tang on all WATERMAID® Cells (which is the small metal "tang" located on the
inside of the Cell, above the mesh electrode) needs to be kept clean.
* Do NOT tap the Cell casing with ANY instruments.
* Boiling water is NOT recommended in Cell cleaning as it may discolour the casing.
* NEVER POUR NEAT (UNDILUTED) ACID DIRECTLY INTO THE CELL.
* ALWAYS ADD ACID TO THE WATER.
* WEAR RUBBER GLOVES when handling acid.
* Always have either a hose or a bucket of water nearby for accidental spills. Please read the
manufacturer's safety precautions when handling acid.
(iv) DISCONNECTING THE CELL FROM POWER SUPPLY
*Turn OFF the power to the WATERMAID® at the power outlet.
*Unscrew the cover of the black junction box located on the underside of the WATERMAID® Power
Supply.
*Unscrew the single screw holding the Cell Cable, as well as the 3 brass screws holding the wires.
*When reconnecting the wires, ensure the connection is TIGHT and that the wires are connected
correctly [refer to section 2(v)].
(v) AGE OF THE CELL
After a number of years the active coating on the anode (mesh) electrode will wear away. At a much
slower rate, the centre solid electrode will also wear away. Calcification, acid cleaning, current density
and solids in the water contribute to the wear rate of the electrodes.
Generally, the precious coating on the anode is lost at a rate of 1 microgram per amp hour. This means a
WATERMAID® Cell should have a 5-8 year life.
The use of neat (undiluted) acid solutions will deteriorate the precious coating of the anode electrode,
drastically shortening the life of the Cell.
Copyright © Watermaid Pty Ltd

11
(ii) SCALE FORMATION
If the pool surface is fibreglass, fibreglassed concrete, painted concrete, vinyl-lined, epoxy coated or
some similar inert surface, then scale can originate only from the water supply or chemicals which have
been added to the water and is therefore usually insignificant. If the pool surface is marblesheen,
pebbled, quartzon or tiled, then scale can originate from either the water supply, chemicals added to
the water or minerals that leach out of the walls.
It has been observed for many years, that salt chlorination Cells used in sea water conditions rarely foul
up with hard crystalline deposits. The soft mushy deposit in these cells can always be cleaned with a
strong jet of water or the use of a dilute acid solution.
By contrast, Cells used in marblesheen, pebbled, quartzon or tiled pools that have had calcium
hypochlorite (for hardness) or copius amounts of acid added, continually foul up and form deposits
that are hard, crystalline and difficult to clean. This can then stop the Cell from working within a few
days.
Scale is usually calcium carbonate, but can also include traces of other compounds. Sea water usually
contains roughly 1700 ppm calcium and 400 ppm magnesium, whereas many swimming pools normally
contain up to 400 ppm calcium but no magnesium. It has been noted that after the addition of
magnesium, to a level of about 20 ppm, Cells begin to mimic the sea water experience and the effect
can last some 6 to 9 months.
It is recommended that 25 Kg (55 lb) per year of magnesium chloride be added to the pool. All
25 Kg (55 lb) may be added to the pool at the one time. Magnesium chloride can replace all other
chemicals for any ‘hardness’ requirement.
It is also recommended that the calcium level in the water be not more than 120 ppm. A
calcium level above 200 ppm is considered excessive.
The use of chemicals containing calcium is NOT recommended for use with the
WATERMAID® WM40 chlorinators. These chemicals include calcium chloride ("calcium hardness")
and calcium hypochlorite ("granular/powdered chlorine").
Heavy scale build-up on the Cell electrodes can inhibit chlorine production, restrict water flow and
damage Cell beyond repair (voiding warranty). To rectify, the Cell will need to be cleaned manually and
the calcium level in the water reduced. To reduce the calcium level in the water, it may be necessary to
empty some of the water from the pool and top it up with tap water or collected rain water. The salt
will then need to be topped up to the appropriate level.
As each pool situation is different, the amount of build-up that is generated will also differ. It is
important for pool owners to maintain water balance (refer to section 10).
(iii) MANUALLY CLEANING THE CELL
1. Turn OFF the power to the chlorinator and pump. There is no need to disconnect the Cell from the
Power Supply when cleaning.
2a) For QT and XT series Cells, unscrew the white barrel nut at the top anti-clockwise and the
bottom clockwise to remove the Cell from the pipe work. Aim a strong jet of water into the Cell. If all
scale is removed successfully proceed to step 5, otherwise proceed to step 3.
b) For EZ300 Cells: If the mesh electrode is clean, then separate the electrodes by pulling the brass
plug out of its socket, unscrewing the barrel nut anti-clockwise and lifting the centre electrode out. Aim
a strong jet of water at the centre electrode to dislodge most of the scale, then use a rag to wipe the
electrode clean. Only the centre electrode (being solid titanium) may be scraped clean. If all scale is
removed successfully, proceed to step 5.
If both the mesh and centre electrodes contain scale, leave the Cell electrodes intact and remove the
entire Cell by unscrewing the T-Piece Barrel Nut (refer to Parts View, page 8). Do NOT attempt to
clean the mesh electrode by abrasion. Proceed to step 3.
If the barrel nut is difficult to unscrew, the use of rubber gloves will give a better grip or pour some hot
(not boiling) water over it. A small amount of vaseline over the thread for next time may make removal
easier.
Copyright © Watermaid Pty Ltd
10
4. AUTO CELL CLEANING
The WATERMAID® Power Supply is programmed to perform the following cycle:
1. Produce chlorine for 1 hour and 5 minutes, once water is flowing through the Cell.
2. Auto Cell Clean for 5 minutes (indicated by a blue flashing light).
3. A quick check for error conditions (indicated by a red flashing light).
4. Produce chlorine for 55 minutes and then repeat steps 2 - 4, until the WATERMAID® is turned off.
5. THE TIME CLOCK
1) Set the current time by turning the clock face in a clockwise direction so that current time aligns with
the arrowhead (top right of time clock).
2) Set the desired times for the chlorinator to switch on and off (refer to section 8 "Running Times") by
aligning the pins as follows:
For On settings, slide the pins away from the centre of the time clock.
For Off settings, slide the pins towards the centre of the time clock.
3) Now position the switch to the middle setting " " (for time clock settings).
N.B. If the time clock on the WATERMAID® Power Supply is different to the one pictured above and has
just two settings, only the "I" and "clock" settings will be applicable.
6. THE WATERMAID® CELL
(i) CHLORINE PRODUCTION
Each WATERMAID® Cell is capable of chlorinating a pool up to 120,000 litres (approx. 27,000 gal). The
recommended chlorine level is between 1 and 3 ppm for a pool, or between 3 and 5 ppm for a
spa. Chlorine production can be tested by taking a sample of water directly from the outlet flow. This
reading should be greater than elsewhere in the pool by approximately 0.5 ppm.
The expected life of a WATERMAID® Cell is 5-8 years. As the Cell wears out, less and less chlorine will
be produced.
Only a genuine WATERMAID® replacement Cell should be fitted, to ensure compatibility with the
WATERMAID® Power Supply model WM40.
*One revolution equals a 24-hour cycle.
*The time is in 24 hour time (e.g. 18=6pm).
*Each pin equates to a 15 minute interval.
It is recommended that a time clock be used to
control the pump, filter and WATERMAID®
chlorinator, and this may be internal or external
to the WATERMAID® Power Supply. For an
internal time clock, the 3 settings are as follows:
"I" setting = chlorinator will be ON permanently.
" " setting (position in the middle) - chlorinator
will operate according to the time clock's
programmed settings.
"O" setting - chlorinator is on standby.
TO SET THE TIME CLOCK
Turn OFF the power to both the WATERMAID®
chlorinator and pump so that both do not start
and stop erratically whilst the time clock is being
adjusted.
"I" Setting
"O" Setting
Arrowhead
" " or Clock
Setting
Copyright © Watermaid Pty Ltd