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3M 3MRO401 Installation And Operating Instructions For

Made by: 3M
Type: Installation And Operating Instructions For
Category: Water Dispenser
Pages: 12
Size: 0.47 MB


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Installation and Operating Instructions For 

3MRO401 Reverse Osmosis Drinking Water 
Filtration System

Installer: Please leave manual with homeowner.

Homeowner: Please retain for operation and 
future maintenance instructions.


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Read, understand and follow all safety information contained in these instructions prior to installation and use of 
the 3MRO401 Reverse Osmosis Drinking Water Filtration System. Retain these instructions for future reference.

Intended use:

The 3MRO401 Reverse Osmosis Drinking Water Filtration System is intended for use in fi ltering drinking water in resi-
dential locations and has not been evaluated for other uses.  The system is typically installed beneath a kitchen sink

, and 

must be installed as specifi ed in the installation instructions by a qualifi ed professional installer. 








Indicates a potentially hazardous situation, which, if not avoided, could result in death or serious 
injury and/or property damage.

Indicates a potentially hazardous situation, which, if not avoided, may result in minor or moderate 
injury and/or property damage.

Indicates a potentially hazardous situation, which, if not avoided, may result in property damage.


To reduce the risk associated with choking:

Do not allow children under 3 years of age to have access to small parts during the installation of this product.

To reduce the risk associated with ingestion of contaminants:

Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before 

or after the system.  Systems certifi ed for cyst reduction may be used on disinfected water that may contain fi lter-
able cysts. EPA Establishment # 070595-CT-001

To reduce the risk associated with a hazardous voltage due to an installer drilling through existing electric wiring 
or water pipes in the area of installation:

Do not install near electric wiring or piping which may be in the path of a drilling tool when selecting the position to 

mount the fi lter bracket.

To reduce the risk of physical injury:
  • All hydro-pneumatic pressurized tanks must have an appropriate pressure relief valve installed.
  • Shut off inlet water supply and depressurize system as shown in manual prior to fi lter removal.

To reduce the risk of injury associated with household bleach:

•  Read and follow manufacturer’s directions and cautions.
•  Keep out of the reach of children.
•  DO NOT intermix with other chemicals.

To reduce the risk associated with ingestion of water contaminated with sanitizer:
  • After installation, sanitizers must be fl ushed from the system before fi rst use as directed within the installation 

instructions (dilute bleach solution).


To reduce the risk of eye injury while drilling countertop for faucet installations:

Safety glasses MUST be worn during the sink hole drilling operations.



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Failure to install or operate your fi lter system in accordance with these use instructions or any 
other installation or use instructions accompanying this product may result in product failure and 
property damage, including water leakage and will void warranty.


To reduce the risk associated with property damage due to water leakage:

 • Read and follow Use Instructions before installation and use of this system.

  •  Installation and Use MUST comply with all state and local plumbing codes.

 • Protect from freezing, remove fi lter cartridge when temperatures are expected to drop below 40° F (4.4° C).

 • Do not install systems in areas where ambient temperatures may go above 110° F (43.3° C).

 • Do not install on hot water supply lines.  The maximum operating water temperature of this fi lter system is 100°F 


 • Do not install if water pressure exceeds 100 psi (689 kPa).  If your water pressure exceeds 80 psi, you must install a 

pressure limiting valve.  Contact a professional qualifi ed installer if you are uncertain how to check your water pressure.

 • Do not install where water hammer conditions may occur.  If water hammer conditions exist you must install a water 

hammer arrester.  Contact a professional qualifi ed installer if you are uncertain how to check for this condition.

  •  Where a backfl ow prevention device is installed on a water system, a device for controlling pressure due to ther-

mal expansion must be installed.

 • Do not use a torch or other high temperature sources near fi lter system, replacement fi lters, plastic fi ttings or 

plastic plumbing.

  •  On plastic fi ttings, never use pipe sealant or pipe dope. Use PTFE thread tape only, pipe dope properties may dete-

riorate plastic.

  •  Take care when using pliers or pipe wrenches to tighten plastic fi ttings, as damage may occur if over tightening 


 • Do not install in direct sunlight or outdoors.

 • Do not install near water pipes which will be in path of a drilling tool when selecting the position to mount the 


  •  Mount fi lter in such a position as to prevent it from being struck by other items used in the area of installation.

  •  Ensure that the location and fasteners will support the weight of the system when installed and full of water.

  •  Ensure all tubing and fi ttings are secure and free of leaks.

 • Do not install unit if any fi tting collets are missing. Contact 3M if collets are missing from any fi ttings.

  •  All hydropneumatic tanks must have an appropriate pressure relief valve installed.

  •  The disposable replacement fi lters must be replaced every 12 months, at the rated capacity or sooner if a notice-

able reduction in fl ow rate occurs.  

  •  The RO membrane module must be replaced every 36 months, at the rated capacity or sooner if a noticeable 

reduction in fl ow rate occurs.



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  This manual explains the installation, operation and maintenance of the 3MRO401 Reverse Osmosis Water Filtration 
System.  Please read each section of this manual carefully.  
  The RO drinking water system is designed to connect permanently to a home’s plumbing system.  The installation MUST 
conform to your state and local plumbing codes.  Advanced plumbing skills are required to complete your installation.  
Failure to install the system as instructed will VOID the warranty.


I. Installation Instructions

A.   Determine the system location ........................................................................................................5
B.   Prepare the area for installation ......................................................................................................5
C.   Determine faucet mounting location ...............................................................................................5
D.   Make the faucet mounting hole .......................................................................................................5
E.   Mount the faucet .............................................................................................................................6
F.   Prepare the system for installation .................................................................................................6
G.   Install the feed water connection and tubing ..................................................................................7
H.   Prefill and sanitize the storage tank ................................................................................................7
I.     Install the drain connection .............................................................................................................7
J.   Install the filtration assembly and storage tank ...............................................................................8
K.   Make the tube connections .............................................................................................................8
L.   Start up the system .........................................................................................................................8
M.   Flush the system and check the operation ......................................................................................8
N.   Installation troubleshooting.............................................................................................................9

II. Operation & Maintenance Instructions

A.   Important water quality assurance requirements ............................................................................10
B.   Replacing the filters ........................................................................................................................10
C.   Replacing the RO membrane module .............................................................................................10
D.   Sanitizing the RO system ................................................................................................................11
E.   Long term non-use .........................................................................................................................12

III. Limited Warranty



• Installation requires some household tools and novice plumbing skills.  If you replace your own 

kitchen and bathroom faucets, you can handle this!

• Installation may require drilling a hole in your sink top.  A variable speed drill and specialized drill bits 

may be needed.  We highly recommend professional installation!


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The system should be located under a sink.  The exact placement 

of the various components will vary from installation to installation.  
You must decide where to install the faucet, tank and filtration 
assembly by balancing convenience with ease of installation and 
servicing.  (See Fig. 1).



Inspect the cold water supply line and determine if any special 

fittings, in addition to what is included in the kit, are required.


It is a good idea at this time to check the condition of the undercounter 
plumbing for any existing or potential leaks. Make sure to perform any 
necessary repairs prior to the installation of the drinking water system.

I. Installation Instructions



Sink Drain

Storage Tank

Filtration System

1/4" Orange


3/8" Yellow

Pressure Relief Valve
(required, not included)

Storage Tank Valve

Red SFC Tubing

1/4" Green




3/8" Blue


3/8" Black



Fig. 1




If the sink already has a hole provided that can accommodate the 

RO faucet, then no drilling is required.  Additionally, a sprayer may be 
disconnected to provide a suitable mounting hole for the RO faucet.  A 
pipe cap or plug will be required to seal the connection.  

If drilling is required we strongly recommend you contact a 

professional installer.  The faucet should be positioned so that it empties 
into the sink and the spout swivels freely for convenience.  

Before drilling the hole, always check underneath the sink to ensure 

that nothing will interfere with mounting the faucet such as reinforcing 
ribs, support brackets or the cabinet construction.

If drilling a hole in your sink is required, the professional installer 

should follow the instructions below.


Drilling 7/8” diameter hole through countertop or stainless steel sink:
1.  Locate area to be drilled.  Mark center of hole with center punch.
2.  Drill hole with 7/8” drill bit suitable for countertop materials or cast 

iron/stainless steel.

3.  With grinding wheel or fi le, smooth out any rough edges.

To reduce the risk of eye injury while drilling countertop for 

faucet installations:


Safety glasses MUST be worn during the sink hole drilling 



The drinking water system faucet should be located on a fl at surface, 

conveniently located near the sink, so that it empties into the sink.  
Most sinks have pre-drilled holes designated for sprayers, soap 
dispensers, and other accessories.  If your sink does not have an 
extra hole, we highly recommend professional installation.


Porcelain, enamel, and ceramic sinks require special procedures for 

drilling holes.  Professional installation is highly recommended.



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Drilling hole through Porcelain/Enamel/Ceramic Sinks

If you are reading this section, professional installation is highly 

Recommended Tools:

•  Variable Speed Drill

•  Porcelain Cutter Tool Set (7/8” Size)

• Plumber’s 


Note: It is important to understand this procedure.

1.  The glassy layer of porcelain/enamel/ceramic must be scored 

through to the metal base, creating a disk.

2.  This disk must be removed while protecting the surrounding deco-

rative coating against chipping or fracturing.

3.  The base metal must be drilled through to complete the hole.


1.  Mark center for 7/8” hole.

2.  Form a dam of shallow putty around hole location and fi ll with 

enough water to lubricate carbide drill bit.

3.  Carefully drill pilot hole through porcelain/enamel/ceramic and base 

metal using a carbide pilot drill bit.  Always operate drill with light 
pressure at slow speed (300 - 400 rpm).

4.  Drill porcelain/enamel/ceramic using special 7/8” cutting tool, 

making certain a complete ring has been cut through to the sink’s 
metal base.

5.  Change to metal cutting drill bit and drill out the center of the ring, 

making sure not to contact other rim of decorative coating.  Cut 
through metal sink base.



Undercounter installations require a faucet with a built-in air gap 

such as the one included with the system.  

Undercounter Installation With An Air Gap Faucet (Air Gap is provided 
by hole 1” above faucet base):

1)  Familiarize yourself with all of the components shown in the air

 gap faucet diagram. (See Fig. 2)

2)  The rubber washer may be re placed with a bead of plumber’s putty for 

a neater appearance.  Remove 3/8” tubing in front of the black faucet 
handle and discard.  Push faucet spout into where the 3/8” tubing was 
just removed.

3)  Slide the chrome base plate and rubber washer up the threaded base 

of faucet.

4)  Connect the 1/4” green tubing supplied in the installation kit to the 


smaller barb on the air gap faucet.  Push it on firmly until it seats.

5)  Connect the supplied 3/8” black tubing to the larger barb on the air 

gap faucet.  Push it on firmly until it seats.

6)  From above the sink countertop, feed the air gap tubing and the 


threaded nipple through the faucet mounting hole and position the 


faucet spout over the sink.

7)  From below the sink/countertop, install the white spacer (open side 

toward the air gap tubing), flat washer, lock washer and hex nut onto 
the threaded nipple and tighten it by hand.

8)  Back off on the hex nut just enough to slide the slotted washer (open 

side toward the air gap tubes) between the white spacer and the 


underside of the sink/countertop.

9)  After rechecking the faucet orientation, tighten the hex nut with a 


9/16” wrench until the faucet feels secure.

10)  From above the sink, make any minor orientation corrections by turning 

the faucet on its flats with a padded adjustable wrench.  Use care not to 
mar the finish.



Check to see that the air charge in the empty tank is approximately 

7 psi (48 kPa). Note: Check the storage tank air pre-charge. Adjust it if 
necessary.  To help keep the membrane as clean as possible, the RO 
membrane cartridge has been shipped separately in a sealed plastic bag.  


Fig. 2


Faucet with Air Gap

Side View

Back View

Air Gap hole

1/4” Standard 
green tubing

Special red “SFC” 
tube from RO

Black 3/8” Reject 
tubing to drain

Blue 3/8” Product 
water tubing 

Blue 3/8” Product 
water tubing connection

1/4” x 3/8” 
tube connector

1/4” x 3/8” 
tube connector

Chrome base plate

Rubber washer

Threaded nipple

Lock washer

Flat washer


Hex nut

Slotted washer


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1)  Open faucet and turn off cold water supply to relieve pressure. 
2)  Locate the cold water stem on the underside of the faucet fixture. 

Unscrew the cold water feed tube from the faucet stem. Locate the 
Faucet Adapter that came with your drinking water system. Insert 
the black gasket into the threaded adapter and tighten onto the 
Faucet Cold Water Stem under the sink, making sure that 1/4” side 
connection is accessible and not facing the wall. Make sure not to 

3)  Take the Cold Water Feed Tube and attach to the Faucet Adapter, 

making sure not to over tighten.

4)  Locate the 1/4” Orange Tubing and insert into the 1/4” outlet of 

Faucet Adapter.  See Figure 3 and “Using Push-in Fittings” below.

5)  Leave cold water supply off. 



Prefilling the storage tank is always recommended so that there is 

pressure to check for leaks as well as sufficient water to flush the carbon 
block post-filter. The RO Drinking Water System substitutes the granules 
with a half teaspoon of common unscented household bleach.

 (Refer to 

page 2 for additional information.) It is important to use a sanitizer when 
prefilling the tank so the solution can sanitize the tubing, fittings, and the 
faucet at start up.

1)  Remove protective cover from storage tank and discard.  Using an 

eye dropper, dispense 2 drops of ordinary household bleach into the 
end of the tank. Apply PTFE tape (not included) to threaded tank 
connection and install tank valve onto connection. Do not over 
Open the tank valve so that the tank valve handle is parallel 
to the valve body. 

2)  Connect one end of the 3/8” yellow tubing into quick connect tank 

valve. Connect the other end of the 3/8” yellow tubing to the 3/8” x 
1/4” union connector included in the tank sanitization kit.

3)  Connect the free end of the 1/4” orange feedwater tubing to the other 

end of the 3/8” x 1/4” union connector.

4)  Open the cold water supply (making sure the tank valve is still open) 

and allow the tank to fill (about 3 minutes).

5)  Close the cold water supply and the tank valve.  Disconnect the orange 

and yellow tube from the union connector, setting the tank aside while 
proceeding with the rest of the installation (the sanitizing solution 
should be kept in the tank for at least 15 minutes).  Refer to the “Using 
Push-In Fittings” 

NOTE:  If you encounter 
difficulty in removing 
the tubing from the 
3/8” x 1/4” union 
connector, make sure 
the tank valve is closed 
and cut the yellow 
tubing approximately 
1” away from the tank 
valve fitting to relieve 
the pressure.  Remove 
the 1” piece from the 
tank fitting.

IMPORTANT:  After the 
installation is complete, 
it is recommended that 
the 3/8” x 1/4” union 
connector be saved 
for future use in tank 


Before starting this procedure, inspect the condition of the drain 
piping, especially in older homes where the traps and tailpieces can be 
deceptively thin and frail.  If they are in poor condition, replace prior to 
installing the drain connection.

IMPORTANT:  Some local plumbing codes may prohibit the use of 
saddle-type drain connections.  

Undercounter Installation:

The drain saddle assembly is designed to fit around a standard 

1-1/2” OD drain pipe.  For smaller (lavatory type) or larger (ABS pipe) 








Fig. 4


Vertical Position

Horizontal Position



Drain Saddle

Hole should be located on
top of the pipe if drain saddle
is positioned horizontally.

Drain Saddle


Fig. 5

Fig. 3

1/4” Orange 

Faucet Stem


Faucet Adapter

Cold Water
Feed Tube



“Using Push-In Fittings”


To Attach Tubing

Push tubing in as far as 
it will go. Tubing must 
be inserted past o-ring 
and hit backstop. Pull 
tube to ensure it is 

To Release Tubing

Push in grey collet to 
release tubing. With 
collet held, pull tubing 
straight out. 

To reduce the risk associated with property damage due to 
water leakage:
  •  Ensure all tubing and fi ttings are secure and free of leaks.



Cut Tubing Straight


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drains, consult your professional installer for special drain saddles.

The drain saddle should always be installed above (before) the trap 

and on the vertical or horizontal tailpiece.  Never install the drain saddle 
close to the outlet of a garbage disposal because plugging of the RO 
drain line may occur.  (See Fig. 4)
1)  Remove backing on foam seal and place over hole on threaded half 

of the drain saddle.  Place drain saddle at the selected location and 
mark the pipe through the threaded opening.

2)  Drill a 1/4” hole at the marked location through one side of the 

drain tailpiece.

3)  Position both halves of the drain saddle on the drain pipe so that the 

threaded opening is lined up with the hole in the drain pipe.

4)  Use the screws and nuts to clamp the drain saddle onto the 

drain pipe.  Make sure that there is equal space between saddle 
halves on each side.  Do not overtighten (See Fig. 5).

5)  Screw in elbow and orient toward the RO faucet.


Undercounter Installation:

The filtration assembly is usually mounted to the right or the left 

side wall inside of the sink cabinet, taking into consideration the space 
available and the tank location.  Generally, the storage tank is placed in 
the rear of the sink cabinet while the filtration assembly is positioned 
toward the front for replacement filter accessibility.

Install screws and washers halfway, so you can easily slip the 

bracket to wall before firmly setting screws.  NOTE: If you are mounting 
onto sheetrock or drywall, use anchors or screws (not included).

NOTE: It is essential that the filters be installed in the correct location.  
Use the icon coded labels to match the replacement filters with their 
corresponding filter heads.

STEP 1:  Cut open the sealed plastic bag and remove the RO membrane 
STEP 2:  Remove the white plug from the fitting at the bottom of the 
module by pushing in the small white collet and pulling out the plug 
simultaneously. See “Using Push-in Fittings” on previous page
STEP 3:  Remove the sanitary protective cap from the top of the module.
STEP 4:  Connect the red SFC reject tubing by inserting it into the fitting 
as far as it will go, located at the bottom of the RO membrane module. 
Line up the module ears (See Fig 7), insert the module and push it into 
the head until it is fully seated. Twist the module 1/4 turn to the right to 
lock it into place. The final orientation should be such that the module 
fitting is located towards the rear.
STEP 5:  Install remaining replacement filters into their respective filter 
heads using the icon coded labels, matching the replacement filters with 
their corresponding filter heads (See Fig 9).

To mount the filtration assembly, elevate it at least 2” (5 cm) off 

of the cabinet floor and, while keeping it level, mark the location of the 
mounting holes on the cabinet side wall.  Make small pilot holes with an 
awl or a drill and screw in the two mounting screws; leaving just enough 
protruding to allow the bracket mounting slots to slide over them.

NOTE:   If the cabinet side walls are not of solid construction, the 
filtration assembly can be set on the cabinet floor and held against the 
side wall with the mounting screws.  However, the filtration assembly 
will then need to be lifted from the mounting screws in order to remove 
the replacement filters.

The storage tank may be oriented either vertically or horizontally.  It is 
generally placed to the rear of the cabinet but can be set in the front 
center (between the sink basins) for ease of access if space permits.



With all of the components in place, the tubing connections can 

be made. When routing the tubing between the components, several 
guidelines should be observed.


Tubing runs should generally follow the contour of the cabinet 


rather than interfere with the cabinet storage area.


Strive for a neat and orderly tubing “flow” by using fasteners (e.g. 


insulated staples) to secure the tubing.


Arrange the tubing so that there are no sharp bends. Leave some 


“play” in the tubing for ease of servicing, then cut the tubing to the 
desired length.


Try to keep the tubing from the filtration assembly to the tank 


and faucet as short as practical for good flow.

Undercounter Installation:

The filtration system will use 1/4” orange, 1/4” green, 3/8” blue, 

3/8” black and 3/8” yellow tubing supplied with the system.
1)  The 1/4” orange tubing should have already been connected to 

 the feedwater connection under Section G. Insert the other end into 
the “Feed” connection labeled on the filtration system (right side).

2)  Attach the 1/4” x 3/8” union to 1/4” blue tubing on faucet.
3)  Insert one end of the 3/8” blue tubing into the “Faucet” connection 

labeled on the filtration system (left side), and the other end into 
 the 1/4” x 3/8” union per Step 2.

4)  Connect the 3/8” black tubing from the air gap faucet to the 

 drain saddle so that it slopes continuously downward without any 
 loops or low spots. Cut the tubing to the proper length and connect 
 it to the drain elbow.

5)  Insert one end of the 3/8” yellow tubing into the “Tank” 

connection labeled on the filtration system, and the other end into 
 the tank valve.

6)  Route the special red SFC tubing with 1/4” union connector from 

the RO membrane module to the 1/4” green tubing connected 
to the faucet. Do not cut this special SFC tubing. It’s length is 
important to maintain proper efficiency and performance.


1)  Double check to see that all of the connections are secure.
2)  Open the cold water feed valve and check the system for 

leaks. If any leaks are detected, close the valve and correct the 


problem before proceeding.  NOTE:  If a leak occurs at a “Push In” 


plastic fitting, then refer to page 7, “Using Push-In Fittings”.

3)  Lift the faucet handle and open the storage tank valve until a 

stream of water flows.  Close the faucet, wait at least five (5) 


minutes and carefully check for leaks. Correct them as necessary.


1)  With the tank valve closed (the tank should still contain the 

sanitizing solution at this point), open the faucet (set the faucet 
handle in the “up” position) and feedwater valve. Water should 
begin to drip from the faucet within several minutes. Continue 
to flush the system for 24 hours. Water will steadily drip from 
the faucet at the time. During this procedure, the tank is being 
intentionally bypassed in order to thoroughly sanitize the tank and 
also flush the membrane of any sanitizers.

2)  After flushing for 24 hours, shut off the faucet. Open the tank valve, 

lift the faucet handle again and allow the tank to completely empty.    
When the water begins to drip steadily from the faucet the tank 
should be empty.

3)  Close the faucet and reinspect the system for leaks. Allow the tank 

to fill completely (it will take approximately 4 hours), then drain the 
tank again. The water should be discarded because it may contain 
small amounts of sanitizer or sanitizing solution.

4)  The system should be ready to use as soon as the tank refills. 

If any objectionable taste is noticed after the second tankful is 
drained, drain the tank the following day. 



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Problem:  Leak at the drain saddle.
Possible Cause:
  Drain saddle not clamped tightly enough.
Solution:  Tighten the drain saddle screws evenly and firmly.

Problem:  Leak at the fittings threaded connection.
Possible Cause:
  Fitting is improperly taped or not tightened sufficiently.
Solution:  Retape the threaded portion with PTFE tape and thread it in 
firmly.  Do not over tighten.

Problem:  Leak at the fittings push-in connection.
Possible Cause:
  Tubing is damaged if there is a tubing misassembly.
Solution:  Remove the tubing.  Squarely cut off 1/4 inch from the end 
of the tubing using a sharp razor knife and reinsert it into the fitting.  
Make sure that the tubing is pushed in completely until it seats. Refer to 
“Using Push-In Fittings” Section on page 7.

Problem:  Leak at the replacement filter head.
Possible Cause: 
 Damaged or misaligned O-ring.
Solution:   Close the cold water feed valve and the storage tank valve.  
Lift up on the faucet handle and drain the system a minimum of five (5) 
minutes.  Remove the replacement filter where leak is found.  Ensure 
both o-rings are present on the replacement fi lter and are seated into 
grooves; moisten o-rings with water.  DO NOT use any petroleum 
products to lubricate the o-rings. 

Problem:  The faucet leaks from the spout with the handle down.
Possible Cause:
 An obstructed or damaged valve seat in the faucet 
Solution:  Call Customer Care team at 855-3M-WATER (855-369-2837) 
for assistance in attempt to repair.

Problem:  No steady drip from the open faucet after the tank is drained.
Possible Causes:

The cold water feed valve is not open.


A leak from any product water fitting connection.


Air is still trapped in the system.


Open the cold water feed valve completely.


Correct the fitting leak as outlined above.


Wait for the air to be purged from the system.

Problem:  Water leaks from air gap module opening.
Possible Causes:

The drain line is blocked or the drain hole is not drilled through 


The drain line has a loop in it.


Air is locked in the air gap outlet.


There is excessive RO reject flow.


Check to see that the drain line is clear of any obstruction and 


remove the drain saddle fitting to verify that the hole is drilled 




Shorten tubing so that it is as vertical as possible.


Blow air into the air gap outlet using a short length of tubing.


Disconnect the red SFC reject tubing from the faucet air gap inlet 


tubing and check the reject flow rate.  It should be less than 5.9 


ounces/min.  If it is greater than 5.9 ounces/min., replace the red SFC 


reject tubing with the new one of proper length.

Problem:  Too little or no reject flow.
Possible Causes:

Red SFC reject tubing is plugged or damaged.


The cold water feed valve is not open.


Replace the SFC reject tubing with one of proper length.


Open the cold water feed valve completely.

Problem:  Chlorine or other unpleasant taste/odor is evident after the 
initial tank filling.
Possible Cause:
 Residual sanitizer is still in the water.
Solution: Drain and fill the storage tank several times if necessary.

Problem:  Noise in the drain (gurgling or dribbling sound).
Possible Cause:
  The reject water is dripping into the standing water in the 
drain trap.

Make sure that the 3/8” black drain tubing from the faucet air gap 


module slopes continuously downward to the drain saddle without 


any loops or low spots.


Angle the drain piping so that the reject water runs down the side 


of the drain pipe.


Change the location of the drain saddle to the horizontal drain 


pipe or any alternate vertical drain pipe which is farther from the 


trap.  Properly plug the original hole.  Caution:  Make sure the drain 


saddle is always installed above (before) the trap.


Drill larger hole in drain pipe.

Problem:  Little or no water available.
Possible Cause:

Tank has not had time to fill.


Tank has little or no air charge.


RO membrane module output significantly below normal.


Wait.  The tank will take approximately 4 hours to fill.


An empty tank with the ball valve open to atmosphere, should have 
a 7-8 psi air charge.


Contact our Customer Care Team at 855-3M-WATER (855-369-
2837) for instructions.


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Reverse Osmosis drinking water filtration systems contain 

treatment components that are critical for the effective reduction of 
Total Dissolved Solids (TDS) as well as some inorganic chemical 
contaminants.  It is strongly recommended that the user test the water 
periodically (every six (6) months minimum) to verify that the system is 
performing satisfactorily. Routine maintenance is necessary in the form 
of sediment, granulated carbon filter and membrane module, based on 
the following guidelines:
•  Sediment Replacement Filters, Granulated Carbon Replacement 

Filters & Carbon Block Replacement Post-Filters:  Change every 


twelve (12) months, at the rated capacity or sooner if a noticeable 
reduction in flow rate occurs.


RO Membrane Replacement Module:  Change it as required based 
on 90 Percent Rejection.  The recommended maximum service 
life is thirty-six (36) months, at the rated capacity or sooner if a 
noticeable reduction in flow rate occurs.

How Much Water Should the Tank Hold?

The amount of water the storage tank will hold is determined by the 

air precharge and the feed water pressure.  The RO system will fill the 
tank until the pressure in the tank reaches two-thirds of the feed water 
pressure.  With an air precharge of 7-8 psi (48-55 kPa), the following 
chart lists approximate storage capacities when the tank is full:

Feed Water Pressure 

Tank Capacity

80 psi (552 kPa) 

 2.2 gallons (8.3 liters)

60 psi (414 kPa) 

 2.1 gallons (7.9 liters)

40 psi (276 kPa) 

 1.5 gallons (5.7 liters)




NOTE: It is essential that the filters be installed in the correct 
location.  Use the icon coded labels to match the filter cartridges with 
their corresponding filter head.

The life of the filters generally depends on the local water conditions 

(i.e., sediment, rust and/or chlorine levels) while the life of the post-filter 
is generally determined by the length of service.

When to Replace the Sediment Replacement Filter

Every twelve (12) months

 or sooner depending on local water conditions.


A noticeable decrease in water production is an indication that the 


filter requires changing.

When to Replace the Granulated Carbon Replacement Filter

The granulated carbon replacement filter reduces free chlorine in 

the feed water supply to protect the TFCM membrane from chlorine 
attack. To find out the chlorine level in a water supply, call the public 
water supplier.
When to Replace the Carbon Block Replacement Post-Filter

If the filter is being used to control tastes and odors, replace it every 
twelve (12) months or sooner depending on local water conditions.

How to Replace the Filters
  Lift up on the faucet handle and close the cold water feed valve.  

Wait five (5) minutes for the filtration assembly to completely 

2) Remove 


3)  Twist the existing filter 1/4 turn to the left so that the ears on the 

filter are able to disengage from the head.  Firmly pull the filter from 
the head.  It may be necessary to twist the filter slightly from side 
to side to help free it.

4)   Remove the new replacement filter from its protective wrap. 


(Double check to see that it is the correct replacement by 
comparing the labels.)

5)   Remove the protective sanitary cap from atop the replacement filter.
6)  Ensure both o-rings are present on the replacement fi lter and are 

seated into grooves; moisten o-rings with water.  DO NOT use any 
petroleum products to lubricate the o-rings. 

7)  Line up the filter ears, insert the filter and push it into the head until it 

is fully seated.  Twist the filter 1/4 turn to the right to lock it into place.  
(See Fig 7)

8)  Open the cold water feed valve, and carefully check for leaks.
9)  RO System Flush Instructions

Sediment & Granulated Carbon Replacement Filters — Close tank. 
Lift the faucet handle and flush at least two (2) gallons of water 
through system (approximately 10 minutes). 


Carbon Block Post-Filter — Open tank. Lift the faucet handle 
and flush at least two (2) gallons of water through post-filter 
(approximately 30 minutes with tank empty or 5 minutes with 
tank full). It may be necessary to continue flushing until water 
becomes clear.



The life of the RO membrane module depends on the local water 

conditions and proper maintenance, e.g., regular module changes. 


Under typical conditions, the RO membrane module life is thirty-six (36) 
months or sooner.  Unlike the replacement filters, the RO membrane 
module life is not determined by the amount of water used because of 
its self-cleaning feature.

How to Replace the RO Membrane Module
1)  Lift up on the faucet handle and close the cold water feed valve. 

Wait five (5) minutes for the filtration assembly to completely 

2) Remove 


3)  Make sure that there is some slack in the red SFC tubing 

connected to the fitting at the bottom of the RO membrane 
module.  Twist the module 1/4 turn to the left (counterclockwise) 
so that the tubing connection is accessible.  (See Fig 7)


Remove existing red SFC tubing from faucet adapter and membrane 
module by depressing the small collet and pulling the tubing away 
from the fittings.

II. Operation & Maintenance Instructions


Failure to install, operate or maintain your fi lter system in accordance with these use instructions or 
any other installation or use instructions accompanying this product may result in product failure and 
property damage, including water leakage and will void warranty.


Replacement of fi lters will result in the need to sanitize the fi ltration 

system and/or the storage tank.  Please refer to Section D “Sanitizing 
the RO System” on page 11 for further instructions.



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5)  Firmly pull the module away from the head.  (It may be 

necessary to twist the module slightly from side to side.)

6)  Remove the new RO membrane module from its protective 

wrap.  (Double check to see that it is the correct replacement by 
comparing the labels.)  

7)  Remove the sanitary plastic cap atop the module.
8)  Ensure both o-rings are present on the replacement fi lter and are 

seated into grooves; moisten o-rings with water.  DO NOT use any 
petroleum products to lubricate the o-rings.

9)  Connect the new red SFC reject tubing (supplied with replacement 

membrane module) by inserting it into the fitting at the bottom of 
the new RO membrane module as far as it will go, and into the 
faucet adapter.  Line up the module ears, insert the module and 
push it into the head until it is fully seated.  Twist the module 1/4 
turn to the right (clockwise) to lock it into place.

10)  Open the cold water feed valve, and carefully check for leaks.  Carefully 

inspect the fitting at the bottom of the new RO membrane module.

11)  For sanitization of RO system please follow instructions below in 

Section D.

12)  Flush membrane module - refer to Section M, Step 1 and 2 on 

page 8.


Follow the sanitizing procedure for the storage tank and the filtration 
assembly outlined below, followed by 24 hour flush with tank empty 
and faucet open.
To help provide you with the highest quality water from your RO 
Drinking Water Filtration System, it is important to routinely sanitize 
both the storage tank and the filtration assembly as noted below.

IMPORTANT NOTE:  These procedures are only intended to be part of 
a routine maintenance program only and are not designed to sanitize 
systems that have become highly contaminated from misuse.

When to Sanitize the Storage Tank

Upon start-up as described in the beginning of this manual.


After any servicing or routine maintenance which involves the RO 


membrane module, carbon block post-filter, storage tank or faucet.

When to Sanitize the Filtration System

After any servicing or routine maintenance which involves the 


sediment and granulated carbon replacement filters or the RO  



membrane replacement module.  

How to Sanitize the Storage Tank and Filtration System
Sanitizing the storage tank generally requires:

Common household bleach (5.25% non-scented)


Eye dropper or plastic oral syringe

1)  Close the cold water feed valve and lift up on the faucet handle to 

empty the water in the storage tank.  It should feel light when 

2)  Disconnect the 3/8” yellow tubing (system tank) from the ball 

valve on top of the storage tank.

3)  Insert into the yellow tubing 1/2 teaspoon (3 ml) of household 

bleach.  (See Fig 8)

4)  Reconnect the yellow tube to the tank ball valve.
5)  Close the RO faucet and open the cold water feed valve.
6)  Wait 4-5 hours.
7)  Life up the handle of the RO faucet and allow contents of tank to 

drain completely into the sink.

8)  Sanitizing is now complete.
9)  If there is any residual chlorine/bleach taste in the next tank full, 

drain tank completely a second time.


If the RO system is to be left unused for a long period of time 

(greater than 30 days), install new replacement filters.


Remove the red SFC tubing from

the fitting before completely

removing the RO membrane module



Fig. 7


To reduce the risk associated with ingestion of water contaminated 
with sanitizer:
  • After installation, sanitizers must be fl ushed from the system 

before fi rst use as directed within the installation instructions.


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Fig. 8

Fig. 9

1/2 Tsp.




with Bleach

Storage Tank

Carbon Block (post)


Granulated Carbon


III. Limited Warranty

Limited Warranty:  3M Purifi cation Inc. warrants this Product will be free 
from defects in material and manufacture for the following periods from 
the date of purchase. Twelve (12) year for the Product, except for the re-
placement fi lter cartridges and membrane, which are warranted for one (1) 
year. This warranty does not cover failures resulting from abuse, misuse, 
alteration or damage not caused by 3M Purifi cation Inc. or failure to follow 
installation and use instructions. No warranty is given as to the service life 
of any fi lter cartridge or membrane as it will vary with local water condi-
tions and water consumption. 3M PURIFICATION INC. MAKES NO OTHER 
  If the Product fails to 
satisfy this Limited Warranty during the warranty period, 3M Purifi cation 
Inc. will replace the Product or refund your Product purchase price.   This 
warranty does not cover labor.  The remedy stated in this paragraph is 
Customer’s sole remedy and 3M Purifi cation Inc.’s exclusive obligation.

This warranty gives you specifi c legal rights, and you may have other 
rights which may vary from state to state, or country to country.  For any 
warranty questions, please call 

855-3M-WATER (855-369-2837)

 or mail 

your request to: Warranty Claims, 3M Purifi cation Inc., 400 Research 
Parkway, Meriden, CT 06450.  Proof of purchase (original sales receipt) 
must accompany the warranty claim, along with a complete description of 
the Product, model number and alleged defect.

Limitation of Liability:  3M Purifi cation Inc. will not be liable for any loss 
or damage arising from this 3M product, whether direct, indirect, special, 
incidental, or consequential, regardless of the legal theory asserted, includ-
ing warranty, contract, negligence or strict liability.  Some states and coun-
tries do not allow the exclusion or limitation of incidental or consequential 
damages, so the above limitation or exclusion may not apply to you.   

3M is a trademark of 3M Company.
© 2012 3M Company.  All rights reserved.
INSTR8031 0512

3M Purifi cation Inc.

400 Research Parkway

Meriden, CT 06450

855-3M-WATER (855-369-2837)