DWT Prio Expert MO600 User manual

Prio®Expert
User’s Guide
MO600
Reverse Osmosis
Filtration System
with Pump Box
(Storage Tank,
Pump Box Unit with Auto-Flush,
Main Filtration Unit Set)

2
Before operating this appliance, please read the instructions carefully. You
may want to save this guide for your future reference. Failure to follow the
instructions or meet the operating requirements may lead to the product’s
failure, malfunction, property damage or personal injury.
Safety Warning
 Plug the pump unit into an electrical outlet only aer you nish the installation.
 Check if the voltage indicated on the pump unit corresponds to the local
mains voltage before you connect the appliance.
 Do not use the pump unit if it is damaged in any way. Take it to an autho-
rized service center for repair.
 Do not open the pump unit. There are no serviceable parts inside.
 When unplugging the pump unit from the mains, do not pull on the power
cord. Avoid touching the plug with wet hands.
 Do not block air vents of the pump unit or place any items on it. Do not
place it near the sources of heat, radiators, etc. Do not place it in a tightly
closed space where it may overheat.
 Do not place the storage tank near the sources of heat, radiators, etc.
 Keep the appliance out of reach of pets or other animals.
 In case of leakage malfunction or water presence around the appliance
shut o the electrical power to the circuit rst, then pull the plug out of the
electrical outlet.
 Remove the plug from the electrical outlet and shut o the inlet valve during your
vacations or other extended periods of time when the appliance is not in use.
 Unplug the pump unit from the electrical outlet while servicing the main
ltration unit, and changing the membrane or lters.
 Do not use the appliance if operating requirements such as water tempera-
ture/water pressure/electrical supply, etc. are not met. There may be other
local regulations to comply with.
 Do not use the appliance with water that is microbiologically unsafe or of
unknown quality without adequate disinfection before or aer the system.
 The pump unit was not designed to be used with power cord extenders,
power lters, external transformers, outlet splitters, etc.
 Do not use the waste water produced by the appliance for drinking or cooking.
 Never store or operate the appliance in direct sunlight.
 This appliance is not intended for use by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or instruction con-
cerning use of the appliance by a person responsible for their safety.
 Children should be supervised to ensure that they do not play with the ap-
pliance.
 At the end of its life, the appliance should be disposed o in an appropriate
manner.
Disposal
Old appliances still contain many recyclable materials. Therefore, please take
used unit to your retailer or recycling center so that it can be recycled.

3
Description
Congratulations on your purchase of the Prio® Expert R.O. ltration system! With proper
installation and maintenance, it will provide you with high quality drinking water for many
years.
This R.O. system removes odor and most harmful substances such as heavy metal ions and
total dissolved solids from tap water making it tasty, fresh and vital.
This Reverse Osmosis ltration system consists of two units: the sophisticated pump box
with auto-ush control valve and booster pump and the R.O. ltration unit with the R.O.
membrane. To store the ltered water the pressure tank is used.
Please familiarize yourself with the general concept behind the product and main modes of
operation.
Key Features:
 Clean and safe drinking water right in your home. No need to transport and dispose of
bottled water any more.
 Factory-preinstalled lters and membrane for faster and easier setup.
 Filters and membrane quick-change housings for easy regular maintenance.
 Compact and beautiful design.
 Automatic ush valve: for peak performance and healthier membrane. 18 seconds of
powerful ush at the end of each water ltration cycle prevent the scale and debris build-
up on the membrane outer surface.
 The booster pump increases pressure to radically improve the performance and eective-
ness of the R.O. unit in all three key areas: increases ltered water ow (production rate),
increases rejection rate (improves water purication quality), increases recovery rate (de-
creases amount of waste water).
 Prolongs the membrane and pre-lter(s) service life due to increased recovery rate.
 Fully automatic operation of the pump box unit: just open the faucet and get clean water
instantly; automatic shut o and ush.
 LED indicators: easily understand what the state of your R.O. unit is.
 Split, exible installation possible where needed: install the pump box up to 50 feet away
from the R.O. unit itself. Useful for the situations like lack of space or lack of electrical
outlet under the sink, or moving the unit to more appropriate place.
 Idling protection: if you forget to shut o the ltered water faucet for a long time the pump
will shut down automatically for you.
 Full separation of electrical components from the membrane and lters of the main R.O.
unit makes the regular servicing of your R.O. machine both easy and safe: no need to
worry about electrical valves and wires while changing your water lters or membrane.
 Quick ttings for easy tube connections and change of lters.

4
How It Works:
The MO600 reverse osmosis system is a multi-stage automatic ltration machine. The system
consists of the two main units – the pump box and the R.O. unit – which are connected with
three tubes. This inter-unit connection distance is up to 50 . Water supply is done through the
inlet valve, ltered water is rst stored in the water tank and then delivered through the faucet,
and waste water is drained through the drain saddle. Detailed connection scheme is shown on
the following charts.
Usually, both units – the pump box and the R.O. unit with tank – are placed under the sink (such
as in your kitchen) and the ltered water faucet is mounted on the sink deck near your normal
water tap. Aer installation, you will get clean water by simply opening the ltered water fau-
cet. The pump will turn on automatically and will produce ltered water to rell the tank. Once
in each water production cycle the membrane will be ushed for 18 seconds.

5
LED Indicators (on the Pump Box Unit):

No Source: there is no water in the inlet line or it’s pressure is
less than 7.25 psi (0.05 MPa). Make sure the inlet tube is con-
nected and not kinked, and the water inlet valve is open.

Working: the pump is working and connected R.O. unit is
producing the ltered water for you while either ltered wa-
ter faucet is open or tank is not full yet. No action is required.

Ready: ltered water faucet is shut and water storage tank
is full. The pump is o. No action is required.

Flush: 18 s membrane ush is going. No action is required.

Reset: idling protection was triggered. The pump is o. To
restore normal operation power cycle the pump box unit.
Note: for select markets the pump box unit is equipped with the manual ush button. You
may press it to start 30 second extended ush.
Pressure Switches:
The pump box unit is equipped with low and high pressure switches. The low pressure switch
shuts o the pump when there is no inlet water or its pressure is too low. The high pressure switch
shuts o the pump when the ltered water faucet is turned o and water storage tank is full.
Pump:
The pump box unit is equipped with a low voltage booster pump powered by the included
transformer for safe operation.
Inlet Valve:
An adapter ball valve is included to be installed into the cold water supply line to feed water
to the pump box inlet.
Faucet:
Designer faucet for ltered water is included and usually mounted on the sink deck or counter-
top for dispensing the clean, ltered water from the ltered water storage tank.
Water Storage Tank:
Air pressurized 4.0 gallon storage tank (with holding capacity up to 2.5G) is used for ltered
water storage.
Drain saddle:
Fits a standard 1.5” diameter drain pipe to drain the waste water from the drain outlet of the
pump box.
Pre-Filters:
The main R.O. unit has two pre-lters: sediment pre-lter on the rst stage and activated
carbon pre-lter on the second stage. They provide initial ltration of the water and protect
the following thin lm composite R.O. membrane from dirt and aggressive chemicals such as
chlorine oen found in tap water.

6
R.O. Membrane:
The third and main stage of the ltration is R.O. membrane. It is “semi-permeable”, which
means that it allows water to pass through but prevents dissolved particles from passing
through. It splits the feed water into two streams: clean water goes to the post-lter and then
onto the tank and faucet. Waste water with rejected particles goes down the drain.
Post-Filter:
Last stage of ltration is an activated carbon post-lter and/or remineralization for ne con-
ditioning and keeping the extra freshness of your water.
Specication
Operating Requirements:
 Minimum supply water pressure: 7.25 psi (0.05 MPa)
 Maximum supply water pressure: 80 psi (0.55 MPa)
 Minimum water temperature: 41 oF (5 oC)
 Optimal water temperature: 59–77 oF (15–25 oC)
 Maximum water temperature: 95 oF (35 oC) / up to 105 oF (40.5 oC) short-term
 Ambient air temperature: 41–105 oF (5–40.5 oC)
 Water source: tap water supply, chlorinated or non-chlorinated, bacteriologically safe
 Supply water pH range: 4.0-11.0
 Supply water turbidity: < 1 NTU
 Supply water components: Hardness (CaCO3) <180 mg/L (<10.5 gpg), Iron <0.1 mg/L,
Manganese <0.05 mg/L, Hydrogen Sulde 0.00 mg/L
 Maximum supply water TDS: 1000 ppm
 Indoor use only.
 Electrical input: AC 100-240V 50/60 Hz
 Maximum length of the line between the pump unit and the membrane (“split installa-
tion”): 50  (15 m) (purchase of extra tubing may be required)
 Tubing: ¼”
Performance:
Performance of the appliance such as ltered water delivery rate, rejection rate, etc. is highly
dependent on local conditions (inlet water pressure, temperature, TDS and degree of contam-
ination, tank air pressure, etc.) and R.O. system use pattern. Actual performance may vary.
 Filtered water production rating: 75 gpd (270 lpd) maximum
 Filtered water delivery rate (from the tank), typical: 0.27–0.74 gpm (1–2.8 l/min)
 Membrane rejection rate1, typical: 90%
 Recovery rate (system eciency2), typical: 15%
 Drain water ow restrictor: 300 cc (ml/min) nominal, up to 360 cc in working mode, open
ow in ush mode.
 Auto-ush duration: 18±10% s
 Tank Storage Capacity (Total Volume): up to 2.5G (4.0G)
1For all dissolved solids combined as measured by TDS or conductivity meter.
2 Eciency rating means the percentage of the inuent water to the system that is available to the user as
reverse osmosis treated water under operating conditions that approximate typical daily usage.

7
 Tank full rell time, typical: 35-45 min
 Idling protection: 120 minutes (the pump box unit shuts down the pump and goes into ‘reset
required’ mode if working mode continuous duration reaches 2 hours without interruption)
Weight and Size:
Pump box unit:
Size (WDH), body only, excluding protrusions: 8.74 x 4.80 x 12.44” (222 x 122 x 316 mm)
Weight, without water and tubing: 8.6 lbs (3.9 kg)
R.O. ltration unit:
Size (WDH), body only, excluding protrusions: 13.46 x 3.35 x 14.80” (342 x 85 x 376 mm)
Weight, without water and tubing: 8.8 lbs (4.0 kg)
Storage tank:
Size (WDH), body only, excluding protrusions: 10.55 x 10.55 x 14.90” (268 x 268 x 378 mm)
Weight, without water and tubing: 6.0 lbs (2.7 kg)
Warranty:
1 year limited warranty
Package Contents:
(1) The auto-ush booster pump box unit
(1) The R.O. ltration unit
(1) Storage tank
(1) Universal worldwide adapter ball valve
(G1/2” - G3/8” - UNEF 9/16”-24 - JG 1/4”)
(1) Teon tape roll
(1) Faucet
(1) Drain saddle
(1) Wrench
(1) ¼” tank valve
(26  / 8 m) Water tubing ¼”
(1) ¼” x ¼” union check valve
(2) ¼” x ¼” x ¼” union tee tting
User’s guide
Installation
Notes:
1. Shut o the cold water supply under the sink or the location where the system will be
installed. If the existing valve is inoperable, the water supply to the house must be shut
o. Then, relieve the water pressure by opening the cold water tap. Do not connect the
system to hot water source.
2. Depending on your plumbing system and sink/countertop type you may need to use tools
like variable speed drill, drill bits, screw driver, wrench, etc. You may want to ask a profes-
sional service provider such as certied plumber to install the inlet valve adapter, faucet,
and drain saddle to assure a trouble-free setup.
3. During installation you will need to cut the supplied ¼” tubing into segments as needed.
Use your utility knife for that or similar tool. See the following charts to determine the
connection scheme and length of hoses necessary. You may need to purchase extra tubing
for far-reaching split or other corner case installations.
4. Do not connect the pump box unit to the electrical supply until the setup is completed.
5. With initial operation, check for leaks. If a leak is observed, verify that the tubing is
pushed into the quick tting far enough to seal the tubing against the O-ring and that the
tubing was cut at 90o

8
X845
Prio® Expert MO600 R.O. System Connections
drain saddle
R.O. unit inlet
MO600
tank
inlet valve
waste water outlet permeate outlet to the tank
union tee fitting
from waste water outlet of the membrane
to drain or waste water collection container
check valve
filtered water faucet
from inlet valve to R.O. unit inlet from filtered water outlet of the R.O. unit
General connection scheme:

9
IMPORTANT: Cut Tubing At 90° to Ensure a
Watertight Seal:
Units Placement Guide:
Pump box unit
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
R.O. ltration unit
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
Remember this unit must be serviced at regular intervals. Therefore it should be reasonably
accessible (for changing lters or membrane, etc.).
To Connect the Tubing to a Fitting:
1. Remove the lock if present (not present in self-locking ttings).
2. Push. Insert the tube rmly until full stop.
3. Pull the collet back slightly.
4. Replace the lock (if present).
To Disconnect the Tubing:
1. Remove the lock if present (not present in self-locking ttings).
2. Push the collet and hold.
3. Pull the tubing out.
4. Replace the lock (if present).
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here

10
The maximum length of hose connections between the pump box unit and R.O. ltration unit
is 50 . You may place both units under your kitchen sink, or you may place the R.O. ltration
unit with the water storage tank under the sink in your kitchen near the faucet, and the pump
box unit in your bathroom near the electrical outlet, cold water supply and drain pipes.
Installation Steps:
1. Install adapter ball valve (included) to the
cold water supply.
Use some Teon or plumbers sealing tape to
prevent leaks. Use three included threaded
adapters to make dierent connection con-
gurations (see chart for details).
2. Create ½” hole for the ltered water faucet and install it.
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
Tip: If you have a soap dispenser or a water
sprayer in an existing hole you may remove it
and use its hole for the ltered water
faucet.
3. Install drain saddle.
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
The square foam gasket with a circle cut out must be applied to the inside of the drain sad-
dle. Remove sticky tape backing and stick to the drain saddle as shown.
1
23
4
56
7
8
9
10
11
1. Faucet
2. Chrome washer
3. Black rubber washer
4. Countertop or
sink deck
5. Black washer
6. Lock washer
7. Lock nut
8. Insert
9. Sleeve
10. Compression nut
11. Tubing
UNEF 9/16”-24
G3/8” G1/2”
G1/2”
Adapter Adapter
UNEF 9/16”-24
UNEF 9/16”-24
G3/8”
G1/2”
1
Adapter
1
Adapter
2
3

11
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
Drill a ¼” hole in the drain pipe
above the trap and on the ver-
tical or horizontal tail piece. Lo-
cate the drain connection away
from the garbage disposal to
prevent potential contamination
and system fouling.
4. Install water storage tank and mount tank valve.
Tank is a clean water storage container.
Never place the tank in direct sunlight or
near the sources of heat. It’s recommended
to have the tank been installed near the R.O.
ltration unit and the faucet.
Mount tank valve on the inlet-outlet port of
the tank. Use some Teon or plumbers seal-
ing tape to prevent leak.
5. Remove gags and connect tubes as follows. See the connection chart for details.
 Insert water supply tubing from inlet valve adapter into the “inlet” tting
of the pump box unit.
 Insert the supply tubing from the “RO unit” tting of the pump box
unit into the supply inlet of the R.O. ltration unit.
 Connect with the tubing the “tank” outlet tting of the R.O. ltration
unit with the “permeate” tting of the pump box unit through the
T-tting on the way. Then connect with the tubing the branch of the
T-tting with the tank valve tting.
 Insert the waste tubing from the waste water outlet of the R.O. ltration unit into the
“waste” tting of the pump box unit.
 Insert the waste tubing from the “drain” tting of the pump box unit into the drain saddle
(through the optional union check valve on the way) or to a waste water collection con-
tainer. Install the check valve with the arrow in the direction of ow.
 Insert ltered water tubing from the “faucet” outlet tting of the R.O. ltration unit into the
faucet using insert, sleeve and compression nut. See faucet installation chart for details.
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here

12
Initial Washing:
Aer installation it is recommended to perform the initial washing of the system. For this:
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
 shut o the tank
valve;
 open cold water
supply valve;
 open the inlet
valve;
 open the ltered
water faucet;
 plug the pump
box unit’s power
cord into the
electrical outlet;
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
 wait for water to arrive at the faucet (it
may take a while, especially rst time,
water foam and air may be going out of
the system);
 aer water ow appears from the faucet
(the ow is weak and inconsistent) wait for
2-3 minutes more and shut o the faucet;
 wait for auto ush to complete (18 s);
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
 repeat the cycle “open the ltered water faucet – wait for 3 minutes – shut o the ltered
water faucet – wait for auto ush to complete” 5-10 times;
 aer you nished with previous step shut o the faucet, and open the tank valve;
 wait for tank full rell then drain the tank by opening the faucet;
 repeat tank rell and drain once again by shutting o and opening the
faucet, then shut o the faucet and wait for tank rell with clean water;
 your system is ready for use.

13
Regular Use
To get clean water just open the ltered water faucet. The ltered water stored in the tank will
be delivered. The pump will turn on automatically and will rell the tank gradually even aer
you shut o the faucet. The system will shut o automatically when the tank will become full
again. Once in each water production cycle the membrane will be ushed.
Please note that R.O. membrane needs up to 50 hours of active operation before reaching
peak performance in terms of water ow, recovery and rejection rates. The delivery rate and
available amount of ltered water depend on how full the tank is. You may need to shut o the
faucet and wait for the tank rell to get more water.
For your safety and peace of mind please unplug the pump box unit from the electrical outlet
and close the inlet valve before servicing your R.O. system such as changing lters or mem-
brane, or during vacations.
Tips:
 You may install the optional union tee tting to the tubing line prior to the ltered water
faucet to get another line of clean water going to the other point-of-use (such as a sink in
a bathroom or ice maker in your fridge).
 Operating the system using soened feed water greatly reduces the chances of membrane
failure and prolongs lters and membrane service life.
Changing Filters and Membrane
This R.O. system contains the replaceable components critical to the eciency of the system.
Replacement of a component should be with one of identical specications, as dened by the
manufacturer, to assure the same eciency and contaminant reduction performance.
To reduce the risk of water leakage or ooding, and to ensure optimal R.O. system performance:
 Change the disposable pre-lters every 6 months or sooner if you observe a noticeable
reduction in water production rate.
 Change the disposable post-lter every 12 months or sooner if you observe a noticeable
reduction in water ow or production rate.
 Change the disposable R.O. membrane every 24 months or sooner if you observe a notice-
able reduction in water production rate.
Failure to replace the disposable lters & membrane at recommended intervals may lead to re-
duced system performance and cracks in the lter housings, causing water leakage or ooding.
Please note the capacity of the lters and membrane is limited. Their service life depends on
the degree of contamination of the water supply and system usage. All terms apply to normal
household use. Actual performance may vary. You may need to change lters or the mem-
brane sooner than indicated if you notice chlorine or other tastes or smells, etc. Manufacturer
recommends a TDS test every six months.
Replacement Filters:
 K871 (sediment pre-lter)
 K870 (activated carbon pre-lter)
 K866 (R.O. membrane)
 K880 (activated carbon post-lter and
conditioner)
Optional post-lters which can also be used
instead of K880:
 K875 (granular activated carbon post-lter)
 K873 (granular activated carbon with
schungite natural mineral post-lter)
 K870 carbon block pre-lter may also be
used as a post-lter.

14
To prevent leakage or cracks and ensure the safety of operation and top performance do not
disassemble the lters or try to regenerate them.
To change lter(s) or membrane:
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
 shut-o the inlet
valve
 unplug the pump
box unit from the
electrical outlet
 shut o the tank
valve
 relieve the water
pressure by open-
ing the ltered
water faucet
 remove the R.O. ltration unit from its place
for easier access (disconnect external tubes
if necessary) and open the unit’s cover
 locate the lter (membrane) to be
changed, disconnect its inlet and outlet
ttings and remove it
 take new lter (membrane) and install it in the place of the removed one observing the
water ow direction arrow on its label and restoring the connections (see the internal con-
nections chart for details)
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
or
Note: Remove and change back one lter at
a time, one aer another. Do not remove all
lters at once to avoid mixing up the tubes.
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here

15
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
Note: For a pre- or post-lter you only need to connect its inlet and outlet. For the membrane
you have to connect the third outlet – to the waste water line. This outlet is located o the
center of the membrane housing. Elbow check valve tting (with the arrow) has to be con-
nected to the central (permeate) outlet of the membrane housing.
 close the cover, reconnect the external tubes and place the unit back in its place
3 min
3 min
5-10
times
repeat
No skewed cut!
1
4
3
2
1
4
2
3
3/8”
3/8”
3/8”
1/2”
1/2”
1/2”
mount drain
saddle here
never
mount
here
never mount
here
Aer you nished changing lters or the membrane follow the “initial washing” procedure as
described above. With initial operation, check for leaks. If a leak is observed, verify that the
tube or branch pipe of the lter/membrane housing is pushed into the quick tting far enough
to seal the tube against the O-ring and that the tubing was cut at 90o.
membrane K866
pre-filter K871
pre-filter K870
post-filter K880
waste water outlet
permeate (to tank)
R.O. unit inlet
to the faucet
R.O Filtration Unit Internal Connections Chart

16
Water Storage Tank Service
Water storage tank may require air repres-
surizing if you notice low water delivery rate
even with full tank.
The storage tank has the bladder inside
which separates air from water. On the lower
side of the tank there is the air valve con-
nected to the compressed air chamber. The
top water inlet-outlet port (where the tank
valve is mounted) is connected to the pure
water chamber. When you open the faucet,
the compressed air would compress the
bladder to force the water out of the tank.
In an empty tank, air pressure in the air
chamber should be 5-8 psi (0.35-0.55 bar). If
pressure drops below this threshold you may
notice low delivery rate of pure water from
the tank.
To recharge the tank:
 Shut o the water supply valve and un-
plug the pump box unit from the electrical
outlet.
 Drain the tank by opening the faucet to al-
low water to run until it stops.
 Check to see if there is still water in the
storage tank. If the tank feels heavy,
that means you need to recharge the
air chamber and continue the following
steps. If the tank feels light, that means
it is not time yet to recharge the tank at
this moment.
 Locate the air valve. Use bicycle tire air
pump to pump air into the tank through
this valve. Keep the faucet open while
pumping air so that all water inside the
tank can be purged.
 Aer all water has been drained from the
tank, use an air pressure gauge to check
the tank pressure. The tank should have
5-8 psi (0.35-0.55 bar) of pressure when
it’s empty. Add or purge air if necessary.
 Open the water supply valve, plug the
pump box unit to the electrical outlet and
close the faucet to allow relling of the
tank.
Please note that storage tank service life is
limited. Take into consideration that it stores
water of room temperature and is not ster-
ile, thus it may become the source of a sec-
ondary contamination over time. Unpleas-
ant smell or taste may appear in the water.
If changing the post-lter doesn’t solve the
problem your tank may require retirement
and your system needs a new tank.
Prio, Prio logo are the trademarks of DWT Deutsche Wassertechnologien GmbH, Germany.
As used herein, ® denotes registered trademark status in Germany only. Copyright © DWT Deutsche Wassertechnologien GmbH, Germany, 2014, 2018