Waterco Chemflo Plus User manual

User Manual
Chemflo Plus Water Management System

Contents
What is in the box 2
How it Works 3
Initial Pool Balance 4
Basic Requirements –the Pool Owner 5
Installation Guide & Diagrams 6
Front Panel 9
Navigating the Menu System 11
Timer Menu 12
ORP Menu 14
pH Menu 15
Status Indicator, Warnings and Safety Shutdowns 17
Maintenance 19
Troubleshooting 20
IMPORTANT
If the power cord is damaged the unit must be returned to
Waterco for repair.
Always read the instructions and warnings on chemical
containers before using chemicals.
Serial Number........................................
Date of Installation................................
Installed by.............................................

Page 1
What’s in the box?
•Mounting brackets; top and bottom
•Multi-electrode (probe)
•CHEMFLO+ Power Supply and Mains Cable
•Tubing
•Dual peristaltic pump module
•User Manual
•Injection manifold
•Mounting hardware (raw plugs, screws and paper template)
IMPORTANT SAFETY MEASURES:
•Always add concentrated chemicals to water –not the other way around!
•Don’t allow chemicals to mix –dangerous, highly corrosive fumes produced.
•Always wear protective clothing, footwear, gloves and eye protection when
handling pool chemicals to avoid injury.
•If a spill occurs, wash the affected area with fresh water immediately and seek
medical attention.
•Work in a well-ventilated area and avoid inhalation of fumes.
•Read and follow safety instructions on chemical drums.
Operation Following a Power Failure
The CHEMFLO+ unit comes with a timer function built into the operating software. The
timer is a 24-hour type with quartz-crystal control. This Timer is backed-up by a Real-Time
Clock (RTC) similar to those found in computers.
During a power failure the CHEMFLO+ will keep time and maintain AutoMode functions.
If a Filter Cycle is active when power is returned the pump will be turned ON within 1
minute. The CHEMFLO+ will keep all its settings and will not need to be re-programmed.
The CHEMFLO+ is ideal for use in systems where repeated power cuts occur, such as off-
peak power circuits and Queensland’s Tarriff33 system.

Page 2
How it works:
The CHEMFLO+ continuously analyses pool water chemistry while your pool system is
running. The base model has two dosing pumps that dose liquid chlorine and acid to the
pool water flow in response to the water analysis from the probe.
The CHEMFLO+ can also be used to control a Salt Water Chlorinator with and without
extra available dosing from the chlorine dosing pump. The chlorine dosing pump is always
available for manual dosing.
When both the SWC and the chlorine dosing pump are enabled the dosing pump is
activated at an ORP approximately 50mV below the set point. It will then will dose regularly
until the ORP climbs to a point that the SWC can take it the rest of the way. This results in
the doser only covering extra high chlorine demands.
Note: the filter system should always be running when the pool is being used.
Oxidation Reduction Potential
The CHEMFLO+ measures how much chlorine is in pool water by measuring the ORP of
the water.
ORP stands for Oxidation Reduction Potential. Chemicals like chlorine destroy pathogens
(eg harmful bacteria) in water by oxidising them.
The level of oxidation available in the water can be measured chemically with an ORP
sensor contained in the Chemflo+’s multielectrode (probe). This produces a voltage
related to the ORP of the water, which is a measure of the effectiveness of chlorine in the
water.
Varying the ORP will affect how long it takes to destroy harmful bacteria in pool water. For
example, if ORP is maintained at 650mV, E-coli type bacteria will be destroyed in around
one second. However, if the ORP is lowered to 550mV, the same organisms may take up
to 2 hours to be eliminated.
pH Control
When chlorine is added to water the pH always changes –this is because chlorine is not a
neutral chemical. The pH will slowly rise as chlorine is added to the water. A rise in pH
greatly reduces the effectiveness of the chlorine as a sanitiser, so it is important to ensure
that the pH remains in the correct range.
The pH of the water can be lowered by the addition of acid –and your CHEMFLO+ does
this automatically. The CHEMFLO+ multielectrode (probe) measures the pH of the water
and doses the pool with small amounts of acid to keep the pH in the correct range.

Page 3
Initial pool balance
Before you begin using the CHEMFLO+ make sure your pool water is balanced as follows:
Chlorine
If it is a new installation, add enough chlorine (liquid or granular) to achieve a reading of
3ppm on an appropriate test kit.
Stabiliser –needs to be 50ppm
If the pool is outdoors, it is vital that stabiliser (also known as cyanurate and cyanuric acid)
be added and maintained at 40ppm to 60ppm. This compound reduces chlorine
destruction due to sunlight. However, too much stabiliser will reduce the effectiveness of
chlorine and can result in poor quality water so ensure stabiliser does not exceed 80ppm.
Good stabiliser level keeps good chlorine levels and reduces maintenance.
pH –for efficient operation we recommend a pH of 7.6
For chlorine to be effective, the pH must be within a certain range. This is usually between
6.8 (fibreglass/liner pools) or 7.2 (concrete/plaster) and 7.8.
Adjust pH down with acid –powder, liquid sulphuric or liquid hydrochloric. Be very careful
with acid as it can be harmful and corrosive.
Total Alkalinity (TA) –keep it between 80ppm and 120ppm
Total alkalinity is also known as carbonate hardness or TA for short. The recommended
level is between 80 and 120ppm.
TA is related to pH in that it stops the pH from varying quickly with small additions of acidic
or alkaline chemicals. When the TA is low it is almost impossible to control the pH.
To raise the TA, buffer (sodium bicarbonate) is added. This must be done slowly as buffer
will also cause the pH to rise. As an approximate rule every increase of 20ppm of TA will
also cause a 0.1 rise in pH. Once buffer is added it should be left to mix in the pool for a
few hours before reducing the pH.
Phosphates and Ammonia Nitrogen –both should be 0ppm
Phosphate and ammonia nitrogen will make your garden green –and they will do the same
thing to your pool. Check for phosphates and add phosphate remover if necessary. Don’t
let fertiliser get into your pool! Phosphates are also in some cleaning products –check the
label if using around your pool.
When Controlling a Salt Water Chlorinator
Follow the directions for the initial balance for your SWC unit –the difference is likely to
only be the addition of salt or minerals. Note that the CHEMFLO+ unit will turn the power to
the SWC unit on and off –the SWC unit must be capable of functioning in this manner and
should be set to manual operation only (not automatic).

Page 4
Basic Requirements –the Pool Owner
Your CHEMFLO+ maintains pool water biological safety by
controlling the pH and the ORP (sanitation level). It achieves this by
dosing the necessary chemicals into the pool in a controlled
manner. The chemical drums must be checked on a regular basis –
empty drums will lead to poor balance and incorrect operation.
To achieve water safety effectively and efficiently there are other
water balance factors that must be maintained by the pool owner.
The most important water balance factors are described on the
previous page.
Failure to maintain these aspects of pool water balance can lead to
poor water quality and incorrect/unusual operation of the
CHEMFLO+ unit.
In the case of incorrect or unusual operation the pool water must be
tested and any balance problems corrected. After this is done it may
also be necessary to clean the Probe –this is part of the unit
maintenance, see page 24.

Page 5
Installation Guide
Choosing a good location
The CHEMFLO+ is manufactured from weather resistant materials and is designed for
operation in full sun and rain. However, your CHEMFLO+ will benefit if it is protected from
the weather. The CHEMFLO+ Power Supply should not be mounted close to where
chemicals are stored (eg acid and chlorine) as vapours from these chemicals are corrosive
and may damage the electronic controls within the unit.
Insect intrusion (particularly ants) can cause problems with all equipment. Ensure that the
pool equipment area is kept free of insects as much as possible. Insect intrusion is not
covered under the warranty.
Installing the CHEMFLO+ Controller
Locate the CHEMFLO+ Power Supply close to the filtration pump so that it may be
connected easily. Connect the CHEMFLO+ Power Supply to the mains power outlet of the
pool area and make sure this outlet meets all applicable Australian Standard at the time of
installation.
Mount the CHEMFLO+ Power Supply at least 1.5m above the ground and at least 3m from
the pool water. A mounting template has been provided with the CHEMFLO+ that shows
you where to place screws on either a wall or post.
The PUMP socket outlet in the base of the CHEMFLO+ Power Supply is dedicated to the
filtration pump only. Do not use a double adaptor to connect another pump as this will
overload the system and void warranty.
Your CHEMFLO+ has two other power outlets on its base, which can be used to run
lighting or an SWC unit (or other pool equipment). These outlets are also timed, so
accessories can be set to come on and turn off automatically.
Installing the Injection Manifold
The injection manifold should be installed on the return (pressure) side of the pump, after
accessories such as heater, but before the chlorinator cell if fitted. It can be plumbed in as
an elbow or an in-line fitting. Ensure that the water flow is in the correct direction (as
marked on the injection manifold). Make sure the Y-piece is installed close to the
manifold.
Installing the Probe into the Injection Manifold
The probe has a bayonet fitting. To install the probe, simply insert it into the injection
manifold and twist to lock the bayonet fitting. Ensure that the o-ring seal is not twisted or
out of place.

Page 6

Page 7
Chemical drums
Position the chemical drums in a safe and secure location, preferably about 2 metres from
the Chemflo+®. Ensure you have the right chemicals for your pool and that chemicals
have been diluted if necessary. Always take great care when dealing with the chemicals.
Installing the Peristaltic Pumps (Dosing Pump Models)
Mount the peristaltic pumps unit adjacent to the CHEMFLO+ Power Supply, as it is hard-
wired to this power supply.
The injection manifold comes with a Y-piece and gas loops already installed.
Cut lengths of tubing that will reach from the base of each dose pump to the injection
manifold tubing. Connect one end of the tubing to the outlet side of the dose pump (the
direction of flow is indicated by an arrow on the front cover of the pump.) Connect the
other end of the tube to one of the loops near the injection manifold. Make sure the gas
loops are vertical as this will trap any gas from chemical mixing.
Cut another length of tubing that will reach from the base of the peristaltic pump to the
base of the acid drum. Position the acid drum in a safe and secure location, preferably
about 2 metres from the Chemflo+®.
Connect the one end of this tube to the inlet side of the peristaltic pump (the direction of
flow is indicated by an arrow on the front cover of each peristaltic pump.)
Drill an 8mm hole in the lids of the chemical drums and pass the tubing through the hole in
the drum lid. Place a sinker on to the end of the tubing that will be in the drum and then
attach the drum filter. Note that the drum filter incorporates a non-return valve to prevent
back-flow into the chemical drum.
Before placing the tubing into the drum, measure the tubing against the outside of each
drum and wrap several turns of PVC tape around the tubing above the drum lid so that the
drum filter will be 10-15mm above the bottom of the drum. Lower the drum filter and sinker
into the drum and screw on the lid.

Page 8
The CHEMFLO+ Front Panel
Operational Buttons
ON Button
Turn the System On Manually
Press the ON button once to switch the CHEMFLO+ and the pool pump on manually. The
CHEMFLO+ will default back to AUTO and turn itself off automatically at the end of the
next programmed FILTER CYCLE (and this time will be displayed on the LCD).
Increasing Manual Run-time in Hourly Increments
Press the ON button repeatedly (or hold the button down) to increase the manual run time
in hourly increments. The run time is displayed on the LCD. When the desired run time
has been reached, press the ENT button to confirm your selection and the system will
commence operation.
ESC/OFF Button
Turn the System Off Manually
If the CHEMFLO+ and pool pump are running, pressing this button will turn them off
manually. The CHEMFLO+ will automatically turn on again at the start of the next FILTER
CYCLE (and this will be displayed on the LCD).
Return to Home Screen
If you have unintentionally accessed a CHEMFLO+ Menu that you don’t actually require,
pressing the ESC/OFF button allows you to return to the home screen at any time.
ENT Button
Use this button to enter the CHEMFLO+ Menu system and to access the various options in
each Menu. Use the Y/UP and N/DOWN buttons to scroll through menu options and when
your desired menu option is displayed on the LCD, press ENT to access that option.
Y/UP Button and Optional Pool Light
If you have accessed the CHEMFLO+ Menu by pressing the ENT button, press the Y/UP
button to scroll upwards through the various menu options. Some menu options will
prompt a yes or no answer. If you wish to answer “yes”, press the Y/UP button.
If your CHEMFLO+ also controls your pool lighting (optional), you can turn the lights on or
off manually by pressing the Y/UP button. For multi-coloured lights, hold the Y/UP button
down to cycle through the various colours and release once the desired colour is reached.
The CHEMFLO+ has 5 buttons that allow you to
control its functions. Each button is labelled with its
primary function. Secondary functions are labelled
within an outline next to the button. Buttons are backlit
to show activity, with the ESC/OFF button always
available to take you back to the home screen.

Page 9
CHEMFLO+ Display
Line 1 shows the current time and the mode of operation.
In the example above, line 1, tells you that the time is 3:27pm and the
CHEMFLO+ is operating in “Normal Automatic mode”
Note that the CHEMFLO+ displays the time using a 24 hour clock.
Line 2 shows timer information.
In the example above, line 2 tells you that the “unit is turned ON and will turn
OFF automatically at 21:00 (9pm)”
Line 3 displays ORP (Chlorine) information.
In the example above, line 3 tells you that the current ORP is 670mV with the
unit set to provide 650mV
Line 4 displays pH information.
In the example above, line 4 tells you that the current pH is 7.5 with the unit set
to provide 7.6.
Navigating the CHEMFLO+ Menu System
There are three aspects to the general CHEMFLO+ Menu system –the Timer Menu, the
ORP (Chlorine) Menu and the pH Menu. Access the CHEMFLO+ Menu system by
pressing the ENT button and following the prompts on the LCD. If you find you have
ended up in a part of the Menu system unintentionally, you can return to the Home Screen
by pressing the ESC/OFF button at any time.
Use the Y/UP and N/DOWN buttons to scroll through the various menu options until the
desired option is displayed on the LCD. Use the ENT button to confirm that you wish to
select that option.
Once accessed, use the Y/UP and N/DOWN buttons to adjust operational settings up or
down –and confirm adjustments by pressing ENT. To cancel any adjustments, simply
press ESC/OFF to return to the Home Screen.
Advanced Settings Menu
The Advanced settings are accessed by holding down the ESC/OFF button for 4 seconds.
ADVANCED MENUS will appear in the display –press ENT to enter.
Some of the Advanced Settings comprise:
•POOL –information on pool volume and whether it is concrete or fibreglass
•SYSTEM DATA - shows service information
•FILTER CYCLES - 4 Filter Cycles can be active - useful for seasonal adjustment.
•AUX - controls timed operation of auxiliary power outlet
•FULL MANUAL ON or AUTO TIMER ON –use when the CHEMFLO+ is being
run as a “slave” to another controller.
The CHEMFLO+ uses
a four line LCD
display to provide the
user with information.

Page
10
Timer Menu
Setting the time
Once you have installed your CHEMFLO+ and turned it on, you will need to set the correct
time on the Chemflo+’s 24 hour clock.
First, access the Menu System by pressing the ENT button.
The LCD will display the word TIMER MENU. Select this by pressing the ENT button once
more.
Line 2 on the LCD will now read SET TIME HOURS. Press ENT to select this option and
then use the Y/UP and N/DOWN buttons- to adjust the hours on the LCD. Confirm the
correct hours value by pressing ENT again.
The LCD will now show SET TIME MINUTES. Adjust the minutes using the Y/UP and
N/DOWN buttons. When complete, press ENT to return to normal operation.
ADJUST CYCLES Sub-Menu
Your CHEMFLO+ has two filter cycles pre-programmed as factory defaults as follows:
Filter Cycle 1: ON at 7:00 (7am) OFF at 10:00 (10am)
Filter Cycle 2: ON at 18:00 (6pm) OFF at 21:00 (9pm)
You can change the start and finish times of each filter cycle to meet your sanitiser
requirements and to suit your lifestyle.
To adjust filter cycle start and finish times, press ENT to access the CHEMFLO+ Menu
system. Press ENT again to select the TIMER menu and then scroll down using the
N/DOWN button until ADJUST CYCLES is displayed on the LCD.
Select this option by pressing ENT and the LCD will show the start (ON) time of the filter
cycle being adjusted. Use the Y/UP and N/DOWN buttons to adjust the start time. Press
ENT to confirm your selection and then the LCD will show the end (OFF) time for that filter
cycle. Adjust the OFF time in the same way as the ON time and press ENT to confirm.
After ON and OFF times for the first filter cycle have been adjusted, the ON time for the
second filter cycle is shown on the LCD. This can be adjusted in the same way, or if you
do not wish to make any changes, simply press ENT to confirm the time shown on the
LCD. Follow the same process to either adjust or confirm the OFF time for the second
filter cycle, and once this has been confirmed the LCD will display the home screen.

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11
Running Times
We recommend your system be operated for at least 4 hours per day and always run
the system when using the pool.
As sunlight destroys chlorine, it is recommended that the CHEMFLO+ be run mostly in the
evening.
Chlorine is added for sanitation but the filter is needed to remove pollutant particles (dust,
sand etc) and keep the water looking good. The filter must operate for a reasonable
number of hours per day to remove pollutants. If there are adverse local conditions –such
as windborne dust and debris - the chlorine demand will be higher than normal and you will
likely need to operate the system for longer periods to adequately filter the water.
Optional LIGHT Timer Sub-Menu
You can use your CHEMFLO+ to turn your pool or garden lighting on and off automatically,
you can set the ON and OFF times using the light timer menu.
Press ENT to access the CHEMFLO+ Menu system. Press ENT again to select the
TIMER menu and then scroll down using the N/DOWN button until LIGHT MENU is
displayed on the LCD.
Line 2 on the LCD will now read “AUTO? Y/N”. To enable automatic light operation press
the Y/UP-button. Line2 will read “Auto ON” for short period before displaying “ON hh:mm”.
Adjust the ON time using the Y/UP and N/DOWN-buttons and confirm by pressing ENT.
The LCD will now prompt you to set the OFF-time, which is accomplished using the Y/UP
and N/DOWN-buttons as before. Press ENT-to confirm the new OFF-time and the LCD
will return to the home screen.
To disable automatic light operation, access the LIGHT menu in the way described above
and when asked “AUTO? Y/N” - press the N/DOWN button. Line 2 will read “Auto OFF” for
short period then the system will return to normal operation and the light can only be
operated manually (see below for how to do this).
Manual Light Operation
If the CHEMFLO+ is turned on, the light can be turned on or off manually by pressing the
Y/UP-button.
If you have multi-coloured LED lights that cycle through different colours and requiring a
power pulse to change effects, you can hold down the Y/UP-button to cycle through the
options and release when the desired colour or effect is achieved.

Page
12
ORP (Chlorine Menu)
Accessing the ORP Menu
Access the Chemflo+ Menu System by pressing ENT. Use the Y/UP or N/DOWN button to
scroll through the main menu until ORP MENU is displayed on the LCD. Press ENT to
select.
Manual Feed
Having accessed the ORP menu, the LCD will ask “Manual Feed Y/N?”. Press Y/UP to
select and the display will read “FEED 5 mins/75mL” .
You can increase the amount of the dose by pressing the Y/UP button until the desired
dose amount is displayed. (Note: the dose volume displayed is an estimate only)
Press ENT and the peristaltic pump will commence feeding liquid chlorine.
Adjusting the Set Point
The ORP Set Point is the value in millivolts that the Chemflo+ will adjust your pool water to.
You can adjust the ORP Set Point via the ORP Menu.
Enter the ORP Menu as described above, and press the N/DOWN button when asked
whether you wish to do a manual feed and then again when asked if you wish to do a
superchlorination. The LCD will then read “ADJUST SET POINT Y/N?” Press Y/UP to
select this option and then the LCD will display the current set point. Adjust this using the
Y/UP or N/DOWN buttons. Confirm the adjusted set point by pressing ENT. The new set
point will then be displayed on the right hand side of line 3 of the LCD.
SWC (AUX) Settings –for control of a Salt Water Chlorinator
The SWC (AUX) is off by default. To turn it ON simply press Y/UP. You will then be
prompted to keep the chlorine dose pump ON too. If you only require the SWC unit to be
enabled press N/DOWN to disable the automatic chlorine dosing pump –note that it is still
available for manual dosing. Otherwise press Y/UP to allow automation of both systems.
There is a Delay value that can be adjusted from 0 to 60 minutes (default 30 minutes) –
this delays the activation of the dose pump for a period after the unit starts.
When both systems are enabled the chlorine dosing is designed to only dose after the
delay period and when the ORP has fallen far below the set point. This means that the
chemical dosing will occur at times of high demand or very low residual.
Adjust ORP Control On or Off
To disable the ORP System (or re-enable it if it has been disabled) you need to access the
ORP menu and work your way through the MANUAL FEED, SUPER CHLOR and ADJUST
SET POINT questions –pressing the N/DOWN button in response to each question.
The LCD will then read “ADJUST ORP CONTROL TURN OFF? Y/N” (if the system is ON)
or ADJUST ORP CONTROL TURN ON? Y/N” (if the system is OFF). If you press Y/UP,
the system will turn on (or off depending on its current status). If you answer N/DOWN to
either question, the LCD will return to the home screen.

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13
pH Menu
Accessing the pH Menu
Access the Chemflo+ Menu System by pressing ENT. Use the Y/UP or N/DOWN button to
scroll through the main menu until pH MENU is displayed on the LCD. Press ENT to
select.
Manual Feed
Having accessed the ORP menu, the LCD will ask “Manual Feed Y/N?”. Press Y/UP to
select and the display will read “FEED 5 mins/75mL” .
You can increase the amount of the dose by pressing the Y/UP button until the desired
dose amount is displayed. (Note: the dose volume displayed is an estimate only)
Press ENT and the peristaltic pump will commence feeding liquid chlorine.
Adjusting the Set Point
The pH Set Point is the pH that the Chemflo+ will adjust your pool water to. You can
adjust the pH Set Point via the pH Menu.
Enter the pH Menu as described above, and press the N/DOWN button when asked
whether you wish to do a manual feed. The LCD will then read “ADJUST SET POINT
Y/N?” Press Y/UP to select this option and then the LCD will display the current set point.
Adjust this using the Y/UP or N/DOWN buttons. Confirm the adjusted set point by pressing
ENT. The new set point will then be displayed on the right hand side of line 3 of the LCD.
Calibration and Re-setting Factory Defaults
If your Chemflo+ consistently displays a pH reading different from that obtained by manual
testing with a quality test kit, it may be necessary to re-calibrate the multi-electrode (probe).
The instructions below assume the probe is measuring a pH of 7.8.
Caution: do NOT re-calibrate the probe until identical pH readings have
been obtained from at least three tests from around the pool. You will need
to calibrate the probe to the pH value obtained from these test kit results.
Enter the pH menu as described previously and press the N/DOWN button when asked
whether you want to do a manual feed, and then again when asked whether you wish to
adjust the set point.
The LCD will then read “CALIBRATE PROBE?”. Press Y/UP to select this option and the
LCD will read “PROBE Ph = 7.8 ADJUST TO +0.0”. Use the Y/UP button to increase the
adjusted value to the required level. Press ENT to confirm the adjustment and after a few
seconds the Chemflo+ will revert to normal operation and the home screen will display the
new pH value.

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14
Adjust pH System On or Off
To disable the pH System (or re-enable it if it has been disabled) you need to access the
pH menu and work your way through the MANUAL FEED, ADJUST SET POINT and
CALIBRATE PROBE questions –pressing the N/DOWN button in response to each
question.
The LCD will then read “ADJUST pH CONTROL TURN OFF? Y/N” (if the system is ON) or
ADJUST pH CONTROL TURN ON? Y/N” (if the system is OFF). If you press Y/UP, the
system will turn on (or off depending on its current status). If you answer N/DOWN to
either question, the LCD will return to the home screen.
Note: Turning off the supply of acid is not normally necessary and could lead to
unbalanced pool water that is unsafe to swim in. Waterco recommends that you seek
advice from a qualified professional prior to disabling the pH system.
Chemflo+ Status Indicators, Warnings and Safety Features
Normal Operation –Green Status Indicators
When the Chemflo+ is operating normally and ORP and pH readings are within the correct
range, a green status indicator will be illuminated and the LCD will indicate the readings.
Note: it is the pool owner’s responsibility to monitor the pool and periodically
confirm the Chemflo+’s readings with a good quality test kit. Remember that the
Chemflo+ is only able to balance pH and Chlorine levels –but you need to ensure
other factors such as stabiliser levels and total alkalinity are within the correct range
(see page4 for details).
Low Chlorine
If the ORP falls significantly below the set point, this indicates that the chlorine levels in the
pool have fallen and dangerous pathogens in the water are not being destroyed rapidly.
The Chemflo+ will warn of low chlorine with a red status indicator and the word “low” will be
displayed on the ORP line (line 3) of the LCD.
Possible causes include:
•An empty chlorine drum
•Faulty peristaltic pump
•Low levels of stabiliser
•High pH
•Filter requires backwashing
•The multi-electrode (probe) may require cleaning (see page 19 for details)
If each of these factors is addressed, the Chemflo+ will dose the pool with chlorine until the
set level is achieved –at which point the status indicator will revert to green and the
warning will no longer be displayed on the LCD.
High Chlorine
If the ORP rises significantly above the set point, a red status indicator will be illuminated
and the word “High” will appear on the ORP line (line 3) of the LCD.

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15
Possible causes include:
•Manual overdosing (superchlorination)
•Faulty peristaltic pump
•The multi-electrode (probe) may require cleaning (see page 19 for details)
•Low pH (too much pool acid)
•High Total Dissolved Solids (TDS)
There is no simple way to reduce high chlorine levels quickly. However, chlorine levels will
eventually reduce over days (or weeks), particularly if the pool is exposed to sunlight.
Low pH –(Excess Acid)
If the pH of the water drops below the set point, a red status indicator will be illuminated
and the words “LOW pH” will be displayed on the LCD.
The Chemflo+ will automatically prevent any further acid being added to the pool until the
pH is brought back into the correct range by the addition of sodium carbonate or sodium
bicarbonate.
Possible causes include:
•Manual overdosing
•Excessive rainfall
•Faulty peristaltic pump
•The multi-electrode (probe) may require cleaning (see page 19 for details)
•Low Total Alkalinity
•Poor pool water circulation
Safety Shutdown
If the pH falls below 5.8 the Chemflo+ will shut down pump operation to ensure no more
acid gets into the pool.
High pH –(Insufficient Acid)
If the pH rises significantly higher than the set point, a red status indicator will be
illuminated and the words HIGH pH will be displayed on the LCD.
Note that a high pH can drastically reduce the ORP of the pool water, and therefore reduce
the effectiveness of the sanitiser. It is important to restore the pH balance as soon as
possible by adding acid to the pool.
Possible causes include:
•The acid drum is empty
•The pool has been superchlorinated recently
•The pool has a new plaster lining (very alkaline) demanding more acid than can
be supplied by the Chemflo+
•Faulty peristaltic pump
•Filter requires backwashing
•Multi-electrode (probe) may require cleaning (see page 19 for details)
•Injector nozzle is blocked
•Venturi system (if fitted) is blocked
If each of these factors is addressed, the CHEMFLO+ will dose the pool with acid until the
set level is achieved –at which point the status indicator will revert to green and the
warning will no longer be shown on the LCD.

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16
Maintenance
Like all equipment the CHEMFLO+ will look better and last longer if it is maintained and
operated in accordance with these instructions.
The CHEMFLO+ Power Supply
The Power Supply has been design for operation in full sun and weather. However, it will
benefit from being under cover. There is little maintenance required however –some Do’s
and Don’ts –
Don’t:
•Install it in a small sealed enclosure (so it does not overheat)
•Install it in a very hot unventilated shed (so it does not overheat)
•Allow insects to nest in the unit (because they will prevent it from functioning)
•Install chemical drums under or close to the unit (to prevent corrosion)
•Forget about the unit once installed –it should be checked regularly to ensure
that it is working for you
Do:
•Install it as per the instructions
•Check it regularly
•Make sure the pool balance is checked regularly
Cleaning the Multi-electrode (Probe)
If the CHEMFLO+ is consistently giving readings different from those obtained from a test
kit, it may be necessary to clean the multi-electrode.
To do this:
•Remove the probe from the injection point by twisting the bayonet (or if fitted with
a tapping band, by unscrewing the retaining nut) and remove the o-ring.
•Holding the cable, gently swirl the probe in a dilute solution of hydrochloric acid
(pool acid) for two minutes
•Rinse the probe in clean water and then replace it in the injection point, making
sure that the “o-ring” is in place.
•Twist bayonet to lock (or tighten nut with fingers)

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Trouble-shooting
If there appears to be low or no Chlorine Residual:
1. Check stabiliser level is 40ppm –60ppm. Add if necessary and wait for it to dissolve.
2. Have you added any chemical additives recently?
3. Check pool for phosphates and remove if necessary
4. Is the unit turned on and operating the filter pump?
5. If the unit is not running at all, check the fuse in the bottom of the unit.
If there is a high Chlorine Residual:
1. Check stabiliser level is below 80ppm. You may need to dump some water to dilute.
2. Check for phosphate –even low levels of phosphate can lead to faster algae growth
with higher residuals needed to stop it (for the same ORP).
3. if pH was high (eg acid drum empty)) more chlorine will be added to maintain ORP.
If there is an algal bloom:
Most algae is destroyed by normal chlorine levels. Some types need more
chlorine and/or an algicide. We recommend a metal-based algicide such as
copper. Always follow the manufacturer directions.

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