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A.  IMPORTANT WATER QUALITY ASSURANCE 

 REQUIREMENTS

 

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)

B.  REPLACING THE FILTERS

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 (See Fig. 9 for filter identification)

1)

  Lift up on the faucet handle and close the cold water feed valve.  Wait 

five (5) minutes for the filtration assembly to completely depressurize.

2)

  Remove cover.

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 filter 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.

C.  REPLACING THE RO MEMBRANE MODULE

 

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 

depressurize.

2)  Remove cover.

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)

4)  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

10

Failure to install, operate or maintain your filter 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 filters will result in the need to sanitize the filtration 

system and/or the storage tank.  Please refer to Section D “Sanitizing 

the RO System” on page 11 for further instructions.

IMPORTANT NOTES

Summary of Contents for 3MRO401

Page 1: ...dration Hot and cold beverages Cooking and food preparation Pet hydration Aquatic aquariums Optimized For Reduction Of Select Volatile Organic Compounds VOCs System tested and certified by NSF Interna...

Page 2: ...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...

Page 3: ...system Where a booster pump is installed on a water system you must install an appropriate pressure relief valve Pres sure relief valve must be maintained and inspected every 6 months Contact a plumbi...

Page 4: ...ing 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...

Page 5: ...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 foll...

Page 6: ...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 Slide the chrome base plate and rubber washer up the thre...

Page 7: ...y 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...

Page 8: ...ween the sink basins for ease of access if space permits K MAKE THE TUBING CONNECTIONS With all of the components in place the tubing connections can be made When routing the tubing between the compon...

Page 9: ...The drain line has a loop in it Air is locked in the air gap outlet There is excessive RO reject flow Solutions Check to see that the drain line is clear of any obstruction and remove the drain saddle...

Page 10: ...ed valve Wait five 5 minutes for the filtration assembly to completely depressurize 2 Remove cover 3 Twist the existing filter 1 4 turn to the left so that the ears on the filter are able to disengage...

Page 11: ...ly 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 serv...

Page 12: ...tion 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 Purification Inc s exclu...

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