Instructions / Assembly
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FILTER CARTRIDGE REPLACEMENT
The life of the cartridge depends on the water volume used and the 
substances in the water. Normally the cartridge should be changed at intervals 
of three to six months or less. Replace the cartridge sooner if the water 
pressure at the faucet begins to drop noticeably or if you notice changes in the 
taste, color, or flow of the filtered water.
NOTE: Certain types of harmless bacteria will attack cellulose material. 
Cartridges containing cellulose, such as the RS15 and TO6, may seem 
to disintegrate, produce a “sewer” or “rotten egg” odor, or form a black 
precipitate due to bacteria. If this happens, consult OMNIFILTER Customer 
Service for advice or select a different cartridge.
1.  (A) Bypass water to the filter by turning the handle clockwise 
1/2 turn until it comes to a stop. 
NOTE: This will shut off all water flow to the housing. Water going to the 
household is not being filtered at this time. Be sure to fill a bucket of water 
first so you may clean housing after it has been removed. 
(B) Remove bottom of housing by unscrewing.
2.  Locate and remove large O-ring 
(A), wipe clean of lubricant and set aside. 
Discard used cartridge 
(B). Rinse out bottom of housing and fill 1/3 full with 
water. Add 2 tablespoons of bleach and scrub cap and bottom of housing 
with non-abrasive sponge or cloth. Rinse thoroughly. Lubricate O-ring 
(C) with clean silicone. Insert O-ring back into groove and smooth into 
place with finger. 
NOTE: This step is important to ensure proper housing seal. Make sure 
O-ring is seated level in the groove. 
Insert new cartridge 
(D) over standpipe in bottom of housing.
3.  (A) Screw bottom of housing onto the cap and hand-tighten until snug. 
DO NOT OVER-TIGHTEN. Make certain cap standpipe slips into cartridge. 
(B) Slowly turn handle on housing 1/2 turn counter-clockwise to allow filter 
to fill with water. 
(C) Depress red pressure relief button to release trapped 
air. Flush cartridge for 10 minutes, wait one hour, and flush for another 10 
minutes before use. Check for leaks before leaving installation.
TROUBLESHOOTING
Leaks . . . 
between cap and bottom of lter housing:
1.  Turn off water supply and press the red pressure relief button. Remove 
bottom of housing.
2.  Clean O-ring and O-ring groove (located directly beneath threads of 
housing). Inspect O-ring for defects. Replace if needed. Lubricate O-ring 
with clean silicone and replace securely into groove. Screw bottom of 
housing onto cap and hand-tighten until snug. DO NOT OVER-TIGHTEN.
3.  Turn on water supply. Depress red pressure relief button to release 
trapped air. If leaks persist, or if there are other leaks on the system, turn 
off water supply. Call OMNIFILTER Customer Service at 800.937.6664.
on inlet/outlet connections:
1.  Turn off water supply. Depress red pressure relief button to release 
trapped air. Tighten fittings about 1/2 turn with a wrench.
2.  Turn on water supply. If leaks persist, or if there are other leaks on system, 
turn off water supply. Call OMNIFILTER Customer Service at: 800.937.6664.
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