4-Stage Reverse Osmosis Water Filtration System

4-Stage Reverse Osmosis Water Filtration System
Installation and Operating Instructions
Model RO-2500
IMPORTANT: Before installing this reverse osmosis system, make
certain your water supply complies with the following operating
specifications. Failure to do so may reduce the effectiveness of the
system and will void the warranty.
Thin Film Membrane:
Feed Water Pressure:
40 to 100 psi (2.75–6.9 bar)
Temperature Range:
40–100°F (4.4–37.7°C)
2000 ppm
Maximum Hardness*:
10 gpg (171 mg/L)
Sulfide, Iron and Manganese†:
0 ppm <0.1 ppm
Chlorine in Water Supply:
Less than 2 ppm
pH Limits:
Daily Product Water Rate‡:
11.76 gpd (44.5 Lpd)
TDS Rejection:
5 NTU Max
* If the hardness of your water is above 10 gpg (171 mg/L), lime scale
will build up rapidly on the membrane. Scale buildup will plug the
membrane and make the system ineffective. We do not recommend
these reverse osmosis systems to be used with water in excess of
10 gpg (171 mg/L) hardness.
† A maximum total level of approximately 0.01 ppm sulfide, iron or
manganese is permissible. See your local dealer to reduce these
substances in your water.
‡Based on manufacturer's internal testing.
Parts Included: (See back of manual for diagram)
Pre-assembled filter system (mounting bracket, membrane housing,
membrane, pre- and post-filter housings and pre- and post-filter
• Reverse osmosis membrane
• Inlet supply adapter
• Drain clamp
• 1/4-inch Tubing
• Storage tank
• Chrome faucet
• Feed tubing
• Sump wrenches
• Tank valve • 3/8-inch Tubing
System Dimensions:
Tools and Materials Required
•Hand or electric drill
(cordless preferred)
If sink does not have
hole for separate faucet:
• (2) Adjustable wrenches
• Center punch
• Slotted and Phillips screwdrivers
• Cone-shaped grinding
Overall Dimensions:
131⁄2-inch W x 51⁄2-inch D x 171⁄4-inch H
(34.29 cm W x 12.7 cm D x 43.8 cm H)
• File wheel
• Safety glasses
• 11⁄4-inch hole saw or drill bit
17.3 lbs. (7.84 kg)
• Drill bits: 1/8", 3/16", 1/4", 3/8"
• Safety mask
Tank Dimensions:
13 ⁄2-inch W x 8 inch D x 9 inch H
(34.29 cm W x 20.32 cm D x 22.86 cm H)
NOTE: All tools may not be necessary for installation.
Tank Capacity Max:
1.3 gal. (4.9 L)
Tank Air Pressure Empty:
5 to 7 psi (0.34 to 0.48 bar)
Tank Weight (Full):
14.5 lbs. (6.5 kg)
Read installation procedures before starting to determine what tools
are necessary.
Technical Support: 1-800-279-9404 (M-F 7:30 am - 5:00 pm CST)
SH147646 Rev A NO09
How Reverse Osmosis Works
wARNING: Do not use with water that is microbiologically unsafe
or of unknown quality without adequate disinfection before or after
the system.
CAuTION: Filter must be protected against freezing, which can
cause cracking of the filter and water leakage.
CAuTION: Because of the product’s limited service life and to
prevent costly repairs or possible water damage, we
strongly recommend that the bottom of all plastic
housings be replaced every five years for clear and ten
years for opaque. If the bottom of your housing has been
in use for longer than this period, it should be replaced
immediately. Date the bottom of any new or replacement
housing to indicate the next recommended replacement
The RO-2500 Reverse Osmosis (RO) System uses a semi-permeable
membrane to reduce dissolved salts and minerals, improving the
taste and odor of your water. The RO membrane is made of layers of
micron-thin film wound around a hollow center core. Water molecules
can pass through the membrane, but dissolved salts and minerals are
The RO-2500 Reverse Osmosis System features 4-stage filter action.
Your water supply is pre-filtered to reduce dirt and chlorine that may
foul the membrane. The RO membrane separates this pre-filtered
water into PRODUCT WATER and DRAIN or REJECT WATER. Incoming
water pressure forces the product water through the membrane
and into the storage tank. Dissolved solids and other contaminants
cannot pass through the membrane and are sent to the drain as reject
water. When you open the drinking water faucet, product water is
drawn from the storage tank through an activated carbon post-filter,
providing you with cleaner, great-tasting water.
For each gallon of water produced, several gallons are discharged
as reject water. The storage tank can hold up to 1.3 gallons (4.9 L) of
water at a time, for drinking and cooking needs. When used under
the Specifications on page 1 of the manual, your Reverse Osmosis
membranes should last 12-24 months.
• Your water must be within required limits for satisfactory operation.
If not, your membrane life may be shortened and your warranty will
be voided (see Specifications on page 1).
• This reverse osmosis system will not protect against diseasecausing bacteria or remove naturally-occurring harmless bacteria.
• Install on cold water line only.
basic Installation Procedure guidelines
• Do not use wicking or sealer to fit connections into the cap of the
filter. Teflon® tape is recommended.
• For standard, under-sink installation on 3/8-inch (10 mm) steel, brass,
or copper cold water line.
• Please read all instructions and precautions before installing and
using your RO-2500.
• Numbered diagrams correspond with numbered steps.
• Make certain that installation complies with all state and local laws
and regulations.
• The replacement cartridges and reverse osmosis membrane
included with this system have limited service lives. Changes in
taste, odor, and color of the water being filtered indicate that the
cartridge should be replaced (see Replacing the Pre- and PostFilters on page 8, and Replacing the Membrane, on page 9).
• After prolonged periods of non-use (such as during a vacation) it is
recommended that the system be flushed for 5 minutes before it is
• A drinking water cartridge may contain carbon fines (very fine
black powder). After installation, flush the cartridge for 5 minutes to
remove the carbon fines before using the water.
• It is recommended that you run the tap at least 20 seconds prior to
using water for drinking or cooking purposes.
• The contaminants or other substances removed or reduced by this
water treatment device are not necessarily present in your water.
RO Membrane Precautions
hlorine will destroy the TFM-36 membrane. If you use
the RO-2500 with a chlorinated or periodically-chlorinated
water supply, it is ABSOLUTELY NECESSARY to use a
carbon pre-filter (included with the system). This carbon
pre-filter should be changed at least every 3 months to
avoid chlorine bypass. See Warranty for disclaimers and
limitations that apply to the TFM-36 membrane.
• To make sure no chlorine is present in the water that reaches the
membrane, you may want to use a chlorine test kit to check the
brine/reject water that flows from the membrane to the drain. No
chlorine should be detected.
• The TFM-36 membrane is resistant to naturally-occurring bacteria.
• Read all installation and operating instructions before installing and using your RO system.
• Numbered diagrams correspond with numbered steps.
1. Installing the Water Supply Adapter
The supply adapter fits 1/2-inch 14 NPS threads. If local codes permit, it may be used to
connect the RO-2500 to the cold water supply line. If local codes do not permit the use
of the supply adapter, alternate connectors can be obtained from your local plumbing
(A)Turn off cold water inlet supply line. If cold water line does not have a shut-off valve
under the sink, you should install one.
(B) Turn on the cold water faucet and allow all water to drain from line.
(C)Disconnect cold water line from 1/2-inch 14 NPS threaded stub on bottom of main
(D)Using the nut that previously connected the cold water line to the faucet, screw the
cold water line to the male supply adapter threads.
2. Selecting the Faucet Location
The drinking water faucet should be positioned with function, convenience and
appearance in mind. An adequate flat area is required to allow faucet base to rest securely.
The faucet fits through a 11⁄4-inch hole. Most sinks have pre-drilled 11⁄2-inch or 13⁄8-inch
diameter holes designed for spray hoses. The drinking water faucet may be installed using
one of these holes, despite their larger size. If these pre-drilled holes cannot be used or are
in an inconvenient location, it will be necessary to drill a 11⁄4-inch hole in the sink or through
countertop next to the sink for the faucet.
CAuTION: This procedure may generate dusts which can cause severe irritation if inhaled
or come in contact with the eyes. The use of safety glasses and safety mask for
this procedure is recommended.
CAuTION: Do not attempt to drill through an all-porcelain or porcelain-coated sink. For
applications on these types of sinks we recommend using the sprayer hole or mounting the faucet through the countertop.
CAuTION: When drilling through a countertop make sure the area below the drilled area
is free of wiring and piping. Make certain that you have ample room to make
the proper connections to the bottom of the faucet.
CAuTION: Do not drill through a countertop that is more than 1 inch thick.
CAuTION: Do not attempt to drill through a tiled, marble, granite or similar countertop.
Consult a plumber or the countertop manufacturer for advice or assistance.
The following instructions apply to stainless steel sinks only.
(A)Line bottom of sink with newspaper to prevent shavings, parts or tools from falling
down the drain.
Pilot Hole
⁄ 4”
11⁄ 4”
(B) Place masking tape over the area to be drilled to help prevent scratches if drill bit slips.
(C) Mark point with center punch. Use a 1/4-inch drill bit to drill a pilot hole through sink.
(D) Use a 11⁄4-inch hole saw to enlarge hole. Smooth rough edges with a file.
3. Mounting the Faucet
(A) Loosen stem-nut on faucet, remove metal "C" disc (if attached).
(B)Attach large diameter 3/8-inch drain tube to barb fitting at the faucet base. This tube
should be long enough to reach the drain clamp in Step 4.
(C)Attach small diameter 1/4-inch drain tube to other barb fitting at faucet base. This tube
should be long enough to reach right side of the RO Assembly.
(D)Slide chrome plate and black rubber washer onto faucet by threading both drain tubes
through the holes on the plate and washer.
(E)Slide lock washer down threaded section and thread stem nut on. Do NOT tighten nut
at this time.
(F)Use a marker to mark one end of the tubing 5/8-inch from the end. Put the tubing insert
into the tube. Slide the nut over the tubing. Slide the ferrule over the tubing. Wet the
tubing end. Push the tubing into the bottom of the faucet stub up to the mark. Slide the
ferrule up. Slide the nut up and screw it to the faucet. Tighten until slight resistance is felt.
NOTE: DO NOT overtighten the 1/4-inch compression nut.
Snug down and tighten further only if leaks appear after putting the system into operation.
(G)Holding the faucet, feed the three tubes through the hole in the sink. Position the
faucet handle at a desired location.
Counter Top
Installation Continued . . .
(I)Center the faucet and slip "C" disc between the white extension and the bottom of the
counter or sink. Tighten the stem nut with a wrench until it is tight.
(J) Firmly insert goose-neck spout into faucet base.
4.Installing the Drain Clamp
NOTE: If you have a single-basin sink with a disposal unit, call Technical Support for
NOTE: Before installing the drain clamp, check the drainpipes under the sink for corrosion.
Corroded pipes should be replaced before continuing with installation.
(A)Attach the drain clamp to a vertical section of the drainpipe, about 6 inches above
the trap. Make sure the opening on the drain clamp is facing towards the drinking water
faucet (see diagram on previous page).
(B)Using the fitting hole of the drain clamp as a guide, drill a 1/4-inch hole through one side
of the drainpipe.
(C)Remove the drain clamp from the drainpipe and enlarge the hole with a 3/8-inch drill bit.
Use a file to remove rough edges from the drilled hole.
(D)Make sure the black rubber gasket is adhered to the inside of the drain clamp and
place the drain clamp assembly over the drilled hole. Look through the hole and position
the clamp so that the center of the clamp hole is slightly higher (about 1/16-inch) than
the center of the drilled hole. Tighten the clamp securely.
(E) Screw the plastic compression nut onto the drain clamp until hand-tight.
5. Connecting the Faucet to the Drain
CAuTION: This is a gravity drain line. Any loops, kinks or sharp bends must be eliminated
before proceeding. Failure to create a straight line to the drain may result in
reject water leaking through the air gap in the faucet onto the countertop and
below the faucet.
(A)Align the larger reject (3/8-inch) tubing from the faucet with the compression nut on the
drain clamp. Create as straight and smooth a path as possible with the tubing. Do not
kink tube. Cut the tubing squarely below the nut and remove the internal and external
3/8" Tube
(B) Loosen the compression nut two complete turns. Insert the tubing into the nut until
it stops. Tighten with fingers, then tighten 1 to 2 turns with a wrench.
6.Installation of Mounting Screws
(A) If system is being installed under the kitchen sink, locate it on back or right wall.
Make sure to allow ample space for installation. To change the filter cartridges,
a minimum of 11⁄2-inches of clearance is required underneath the filter housings.
A minimum of 2 inches of clearance from the left side of the unit is also required or
5 inches from the left bracket mounting screw hole.
(B)Install mounting screws at least 15 inches from cabinet floor and 71⁄2-inches apart.
Leave a 5/16-inch space between the head of the screw and the wall to slip bracket
onto screws.
NOTE: Each connection fitting on the RO Assembly has a plug that must be removed
before inserting tubing. Push in on the collar and pull the plug out.
7.Connecting the Faucet to the System
11⁄2" (min.)
Port Reference
2" (min.)
(A)Locate the reject tubing (reject water line) from the drinking water faucet. This tube is
the smaller of the two. Place a mark on the tubing 5/8-inch from the end. Moisten the
end of the tubing with water and insert tubing into the quick-connect fitting on the flow
restrictor found on the right side of system behind the membrane.
If tubing is not firmly connected, leaking will occur. It is important for the tubing to be
inserted all the way until the mark is flush with the outer edge of the quick-connect insert.
NOTE: Tubing may be quickly and easily removed from the fitting if necessary by pressing the collar around the fitting then pulling the tubing with your other hand.
(B)The faucet tube from the bottom of the threaded metal tube is inserted into the post
filter. The fitting is at the top left of the RO System. Push the free end of the tubing into
the quick connect fitting.
5" (min.)
Installation Continued . . .
8. Connecting the Storage Tank to the System
CAuTION: When tank is full, it weighs approximately 14.5 lbs. (6.5 kg) Provide ample
1/4" Tube
support under the tank.
(A)To prevent leaks, apply 3 or more wraps of Teflon tape to threads on tank. Thread the
tank valve onto the top of the tank opening. Turn tank so handle is in line with tubing.
CAuTION: The tank /valve connection will leak if not properly sealed. Teflon tape will
normally seal the threaded connection.
(B) Locate the 1/4-inch tubing. Place a mark on the tubing 5/8-inch from each end. Moisten
one end of the tubing with water and insert with a twisting motion into the port of the
tank valve until the 5/8-inch mark is flush with the quick connect fitting. Then locate the
tank near the system's installation area.
(C)Cut the tubing to correct length. Install free end of tubing into white quick-connect
fitting on the post filter tee on the right side. Do not cut tubing.
Teflon tape
Port Reference
(D) Place entire system over mounting screws on wall and slide down.
CAuTION: Make certain system is firmly attached to wall to prevent it from falling and
possibly becoming damaged.
NOTE: Use caution not to bend or pinch the tubing behind the system while attaching to mounting screws.
9. Connecting the Supply Adapter and Inlet Filter
16 mm
(A)Locate remaining length of 1/4-inch plastic tubing.
(B)Push into quick connect fitting on the right side of system.
(C)Cut the tube to a length that will allow connection to the cold water supply fitting.
Ensure the tubing does not kink. Push the tube into the fitting.
1/4" Tube
10.Installing the Membrane
(A)Remove tube attached to membrane housing by pressing in the white collar around the
fitting while pulling the tubing with your other hand.
(B) Hold the membrane housing with one hand and turn the cap (wrench provided) with
other hand to remove. To make it easier to hold the membrane housing, you may want
to remove the post-filter.
16 mm
Port Reference
(C)With clean hands (sanitary gloves preferred), remove the membrane from the plastic
CAuTION: Do not unwrap the tape around the membrane, as it is part of the membrane.
Do not squeeze membrane.
(D) With the double O-ring side first, push membrane into housing until it stops.
About 1/8-inch of the membrane’s plastic core will stick out beyond the housing.
(E)Use clean silicone grease (pack is included with the system) to lubricate both O-rings
and the brine seal. Hand-tighten membrane housing cap until you feel resistance, then
tighten an additional 1/2 turn. Do not over-tighten.
(F)Reinsert the tube by pushing it into the quick connect fitting.
Port Reference
Installation Continued . . .
11.Faucet Operation
(A) For controlled water flow, push the handle down.
(B) For constant water flow, lift the faucet handle to lock it in the open position.
12.System Start-up
NOTE: The reverse osmosis membrane is treated with a food grade sanitizing agent
that may cause an undesirable taste. Although it is not harmful, it should be
flushed from the system.
Push Down
NOTE: The post-polishing filter may contain fine black carbon particles. These fines are
harmless, but may make the water appear gray in color. The carbon fines are
flushed from the system with the first tank full of water.
NOTE: The RO system does not produce a high volume of water on demand as an
ordinary filter does. Water is produced at a slow, drop-by-drop rate. The system
requires about 2 to 4 hours to fill the storage tank. As water is taken from the
tank, the system automatically starts the cycle of replacing the water and then
stops water production when the tank is full.
CAuTION: Visually check the entire system for leaks. If a leak is present, see
Troubleshooting on page 10.
(A) Turn off valve at top of storage tank.
(B) Turn on the cold water supply.
(C) Lift the faucet handle to lock it in the open position and let it drip for 30 minutes.
(D)Completely open the cold water supply until it comes to a stop. Allow water to drip from
the faucet for 3 more hours. Then close the faucet and open the valve on the storage
tank. The tank valve is open when the handle lines up with the tubing connection.
(E)Allow 2 to 4 hours for the tank to fill. Again, periodically check the installation for leaks.
After the storage tank is filled, open the faucet to flush the post-polishing filter. Allow 4
to 5 minutes for all of the water to drain from the tank.
(F) Close faucet and allow tank to fill.
NOTE: Initially, the water may appear cloudy. This is a result of air trapped in the postpolishing filter. It is not harmful and will disappear in a matter of minutes. It may take up to a
week after installing a new post-polishing filter for the trapped air to dissipate.
The system is ready for operation. You can now enjoy quality water from your Reverse
Osmosis System.
Push Up
Tank Valve
Tank Valve
Optional Installation
Connecting your Reverse Osmosis System to Refrigerator Icemaker / Water Dispenser
CAuTION: If you are connecting this unit to your refrigerator/icemaker with initial RO installation, wait to turn on the icemaker until the post-
polishing filter has been flushed according to Step 12.
CAuTION: Use plastic tubing and fittings. Do not use copper tubing or brass fittings.
NOTE: F or optimum performance, it is recommended that the distance between the RO system and the refrigerator icemaker/water dispenser be no
greater than 10 feet (3 m). At distances greater than 10 feet, the water pressure from the system may not be adequate to deliver water to the
MATERIALS REQUIRED (available from your local hardware store):
• 1/4-inch x 1/4-inch x 3/8-inch (0.635 cm x 0.635 cm x 0.952 cm) compression or quick-connect tee
• 10 feet (3 m) of 3/8-inch (0.952 cm) polyethylene tubing
• Shut-off valve
1. Turn off refrigerator water supply and icemaker (consult manufacturer’s guidelines).
2. Close tank valve (on top of storage tank).
3. Turn off water to RO system at the cold water supply.
4. Open drinking water faucet to relieve pressure.
5.Locate tubing (permeate) leading to your drinking water faucet. Cut and insert the
1/4-inch x 1/4-inch x 3/8-inch (0.635 cm x 0.635 cm x 0.952 cm) compression or quick-connect tee into the permeate tubing.
Consult manufacturer’s guidelines before installing the supply adapter.
NOTE: When cutting the permeate tubing, you may experience some water leakage.
6. Using a length of 3/8-inch polyethylene tubing, connect the
icemaker/dispenser line with the free port on the compression tee.
7.The shut-off valve should be installed as close to this port of the tee
as possible. Shut-off valve should be installed in the OFF position
Consult manufacturer’s guidelines before installing the shut-off valve.
8. Completely open cold water supply.
9. Open tank valve.
10. Turn off the drinking water faucet.
11. Turn on water to RO system at cold water supply.
12. Turn on icemaker and open shut-off valve.
Consult manufacturer’s instructions.
13. Check for leaks and tighten connections if necessary.
Replacing the Pre-Filter and Post-Filter Cartridges
7. Insert cartridges in the bottom of the housings. Make sure
cartridge slips over standpipe in the bottom of the housing.
1st Stage Pre-Filter and 2nd Stage Pre-Filter Cartridges:
The cartridge should be replaced every six months. If your
water contains a high amount of sediment, it may be necessary to
change the 1st stage cartridge more frequently. If your water contains
a high amount of chlorine, it may be necessary to change the 2nd
stage pre-filter more often.
1. Turn off incoming water supply and valve on the storage tank.
Place a tray under the system to catch any water that spills during
removal of the filter housings.
2. O
pen faucet to release pressure.
3. U
nscrew bottom of filter housings from caps. Use the filter wrench.
Discard used cartridges.
4. Remove black rubber O-rings from grooves in housings. Wipe
grooves and O-rings clean; set O-rings aside.
5. Rinse out housings and fill each 1/3 with water. Add 2 tablespoons of
bleach and scrub with non-abrasive brush or sponge. Rinse thoroughly.
6. L ubricate each O-ring with a coating of clean silicone grease. With
two fingers, press each O-ring securely into groove below the
threads of the appropriate housing.
NOTE: Be sure to install cartridges in proper housings (see diagram below).
8. Screw bottoms of housings back onto caps securely; do not
over-tighten. Turn on cold water supply.
Check for leaks. Continue to check periodically to make sure
no leaks develop.
4th Stage Post-Filter Cartridge: post-filter should be replaced every
twelve months.
1. Turn off incoming water supply and valve on the storage tank.
Place a tray under the system to catch any water that spills during
removal of the filter housings.
2. O
pen faucet to release pressure.
3. Remove filter from bracket and discard.
4. Remove tubes from fittings by pressing in collar around the fitting
while pulling the tubing out with your other hand.
NOTE: If quick connect fittings need to be installed, tape threads of
fittings with 3 wraps of Teflon® tape and attach to filter.
CAuTION: Ensure the tape is not touching O-ring on the fitting or a
CAuTION: The rubber O-ring provides
leak may occur.
NOTE: T he filter has an arrow on it showing the direction of flow.
The tee fitting connects to the inlet side of the filter and the
elbow fitting attaches to the outlet side.
NOTE: Hand tighten fittings, then tighten with wrench 1/4 turn.
5. Attach 4th stage filter to bracket with the tee fitting on the right
hand side.
6. Attach tubes to fittings by pushing in until the tube stops. Check to
see if tube is in place by trying to gently pull tube out.
the water-tight seal
between the cap and the
bottom of the housing.
It is important that
the O-ring be properly
seated in the groove
below the threads of
the housing or a water
leak could occur.
1/4" Faucet
Drain Tube
3/8" Drain Tube
(4th Stage Post-Filter)
1/4" Feed Tube
1/4" Faucet
Permeate Tube
TFM-36 Membrane
(3rd Stage Pre-Filter)
(1st Stage
(2nd Stage
1/4" Storage
Tank Permeate
Replacing the 3rd Stage Reverse Osmosis Membrane
About the Reverse Osmosis Membrane
11.Close the cold water supply and turn on the drinking water faucet.
Let the faucet run for about 30 seconds before turning off.
When used under operating conditions specified on page 1 of the
manual, your reverse osmosis membrane should last at least one
year. You should replace the membrane after 18 to 24 months. Replace
it sooner if you notice a return of unpleasant tastes or odors or a
noticeable decline in water production. The precise life span of your
system's membrane will depend on the quality of the water entering
the system and the frequency with which you use it. Frequent system
use prevents the filtered salts and minerals from building up on
the membrane as scale. The more water the system is required to
produce, the longer the membrane will last. You may wish to find a
variety of uses for your system in order to prolong the life of
the membrane.
12. Let the entire system stand for 30 minutes to sanitize.
13. After 30 minutes, turn on the drinking water faucet to allow the
bleach water to run out (about 3 to 5 minutes).
14. Unscrew bottom of housings. Discard bleach water and rinse.
Replacing the Membrane and Filter Cartridges
To replace the filters, see Replacing the Pre-Filters and
Post-Filter on page 8.
To replace the membrane, see Step 10: Installing the Membrane, and
Step 12: System Start-up on page 5.
NOTE: After installing new membrane and cartridges, allow system
to run for 3 hours to fill tank. Check for leaks every hour. As
pressure builds in tank, leaks may occur that did not exist
directly after installation.
During extended periods of non-use (such as during a vacation),
remove the membrane from the membrane housing and place it in
a sealed plastic bag. Store membrane in refrigerator for future use.
NOTE: If system stands for more than 2 to 3 days without being used,
the storage tank should be emptied.
Replacing the Membrane and Sanitizing the System and
NOTE: It is recommended that you sanitize the system each time
you change the membrane. It is not necessary to sanitize the
system when changing only the pre-filters or post-filter.
NOTE: When installing a new membrane, it is recommended that
you replace the pre-filter and post-filter cartridges as well.
Removing the Membrane and Filters
1.Turn off the cold water supply. Allow five minutes for system to
Place a tray under the system to catch any water that spills
during removal of the filter housings.
2.Open drinking water faucet to drain tank. When tank is drained,
close faucet.
3. Hold the membrane housing with one hand and remove the cap
with the other hand.
CAuTION: Do not disconnect tubing from membrane cap.
4. To remove the RO membrane, grasp membrane tube with pliers
and pull. Discard old membrane. Screw cap back onto membrane
housing. DO NOT install new membrane.
5. Unscrew filter housings from caps and discard used cartridges.
6. Remove black rubber O-rings from grooves in housings.
Wipe grooves and O-rings clean; set O-rings aside.
Sanitizing the System
7. Rinse out bottom of housings and fill each 1/3 with water.
Add 2 tablespoons of household bleach to each housing and scrub
cap, bottom of housings, and membrane housing with non-abrasive
sponge or cloth. Rinse thoroughly.
8. Lubricate O-rings with a coating of clean silicone grease. With
two fingers, press each O-ring securely into groove below the
threads of the appropriate housing.
CAuTION: The rubber O-ring provides the water-tight seal between
the cap and the bottom of the housing. It is important that
the O-ring be properly seated in the groove below the
threads of the housing or a water leak could occur.
9. Screw bottom of housing onto caps WITHOUT inserting prefilters
and hand-tighten. Do not over-tighten.
10. Open the cold water supply and let the system run for 2 to 3 minutes
to carry the bleach solution throughout the system.
Troubleshooting Guide
Leaks between bottom of housing and cap
Reduced production
1. Ensure sump is tightly screwed to cap. If it still leaks close the cold
water supply and tank valves.
Slow or no product water flow usually indicates either a clogged prefilter or an exhausted membrane. First, replace the pre-filters. If the
production rate is not improved, replace membrane.
2. Clean black rubber O-ring and lubricate with clean silicone grease.
With two fingers, insert O-ring in groove below threads of housing
and press into place. Tighten housing back onto cap.
Gradual return of taste and odor
Gradual return of unpleasant taste and odor over a period of time may
indicate that your filter cartridges and/or RO membrane need to be
replaced. See Replacing the Pre-Filters on page 8 and Replacing the
Reverse Osmosis Membrane on page 9.
3. Open the cold water supply and tank valve.
If leaks persist, call Technical Support.
Leaks on tank valve assembly
Sudden return of taste and odor
1. Open drinking water faucet to drain storage tank. Let drinking water
faucet run until it drips. Turn off cold water supply.
If shortly after complete servicing noticeable taste and odors return
contact Technical Support.
2. Push in on white collar of tank valve fitting and pull out tubing.
Unscrew the tank valve from the storage tank. Rewrap threads on
top of the tank with Teflon® tape. Screw tank valve back onto tank.
Trim 1/2-inch from end of tubing and reinsert 5/8-inch into tank
valve fitting.
No water pressure from the drinking water faucet or
low volume in storage tank
1. Close the cold water supply to system.
2. Lift storage tank to see if it is empty. If not, open the drinking water
faucet to empty water from tank.
3. Open the cold water supply and shut off the reverse osmosis
faucet. Let the system pressurize for several hours and check for
leaks. Check again after tank is fully pressurized.
NOTE: It may be necessary to pump a small amount of air into the tank
with a bicycle pump to remove all the water from the tank.
Leaks on quick-connect fittings
1. Close the cold water supply and tank valve.
2. Depress plastic collar and pull out tubing.
3. When tank is empty, use a pressure gauge to check tank pressure.
An empty tank should contain 5 to 7 psi pressure. Increase or
decrease the air pressure in the tank accordingly.
3. Cut off 1 inch of tubing and place a mark 5/8-inch from end of
tubing. Tubing should be cut squarely. The internal and external
burrs should be removed.
4. Open cold water supply. Let system run for
3 hours to fill tank, then check system performance. If performance
has not improved, call Technical Support.
4. Push tubing 5/8-inch into fitting.
5. Open the cold water supply and tank valve. If leaks persist, call
Technical Support.
Questions or Comments?
No flow or slow flow from the brine (drain) line
Call our Technical Support Department at
Less than 1½ cups per minute
NOTE: Before checking brine (or reject) flow, make sure the system
is producing water by turning off the valve on the storage tank
and opening the faucet. Water should drip from faucet.
800.279.9404 Monday through Friday
7:30 a.m. to 5:00 p.m.
1. Examine the P5 and EPM10 pre-filters. If clogged, replace (see
Replacing the Pre-Filter and Post-Filter on page 8) and recheck the
brine (or reject) flow rate.
Central Standard Time, USA
2. If the pre-filters are not at fault, the brine (or drain) flow controller is
probably clogged. Call Technical Support.
High TDS in Product Water
If high levels of TDS (Total Dissolved Solids) are detected in your
product water (approximately 30% or greater of what is measured in
your tap water, as determined with a conductivity meter or by a TDS
monitor faucet), the RO membrane may need to be replaced, or the
brine (or drain) flow control tubing may be clogged. See your dealer
or plumber to check product water TDS.
Parts Guide
Drain Clamp
3rd Stage RO Membrane TFM-36
Inlet Supply Adapter
4th Stage Post-filter GS-10RO-B with fittings
SW-1 Wrench
RO Housing Wrench
1/4-inch Tubing
3/8-inch Tubing
Valve Auto Shut-off
Tank Valve (1/4" NPT x 1/4' QC)
Membrane Housing
Flow Restrictor, TFM-36
Storage Tank
1st Stage Sediment Pre-filter (P5)
2nd Stage Pre-filter (EPM1O)
* Not Shown.
For replacement parts, contact your nearest Water Filter dealer or call 800.279.9404
PENTEK warrants to the original owner (under normal use): Reverse Osmosis Systems to be free from defects in material and/or workmanship for one (1)
year from the date of purchase. Any replacement products furnished will be free from defects in material and/or workmanship for the remainder of the
original warranty period. This warranty does not cover: (1) pre and post filter cartridges, or reverse osmosis membrane (2) defects not reported within the
above time period, (3) items manufactured by other companies, (4) problems arising from failure to comply with PENTEK instructions, (5) problems and/or
damage arising from acts of nature, abuse, misuse, negligence or accident by any party other than PENTEK, (6) problems and/or damage resulting in whole
or in part from alteration, modification, repair or attempted alteration, modification or repair by any party other than PENTEK, (7) noncompliance with applicable codes/ordinances.
If a defect in workmanship and/or material in a product or part covered by the warranty should arise, PENTEK, at its sole discretion, will repair or replace
the defective product or part (PENTEK may consider, in good faith, the customer’s preference).
All claimed defective product must: (1) be authorized for return by PENTEK with an RGA number (2) include proof of the purchase date of the
product or part (3) returned to PENTEK prior to the expiration of the warranty date, at the customer’s expense, shipment pre-paid, (4) be
accompanied by a letter detailing the Model Number, Serial Number (if any), and a brief description of the problem.
To the maximum extent permitted by applicable law, PENTEK shall not be liable for any damages whatsoever (including, but not limited to, loss of time,
inconvenience, expenses, labor or material charges incurred in connection with the removal or replacement of the Water Filter Housing, special, incidental,
consequential, or indirect damages for personal injury, loss of business profits, business interruption, loss of business information, or any other pecuniary
loss) arising out of the use of or inability to use the defective products or parts, even if PENTEK has been advised of the possibility of such damages.
PENTEKs’ maximum liability under any provision of this Limited Warranty shall be limited to the amount actually paid for the Reverse Osmosis System.
NOTE: Because some states do not allow the exclusion or limitation of incidental or consequential damages, the above limitations or exclusions may not
5730 North Glen Park Road, Milwaukee, WI 53209
Technical Support: 800.279.9404
© 2009 Pentair Residential Filtration, LLC SH147646 Rev. A NO09
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