Filter Cartridge Replacement - Pentair OMNIFILTER U25 Installation Instructions Manual

shown uses copper piping. The weight of the filter should be supported so it does not stress the pipes. The main house
water shut-off valve can be used as the inlet side shut-off valve.
2. Apply about three wraps of plumber tape in clockwise direction to pipe threads of each fitting.
3. Assemble all fittings. Start adapters into cap by hand. Use a wrench to tighten firmly. DO NOT OVER-TIGHTEN.
4. Measure length (shown as X on diagram) across assembled fittings and subtract 1-inch if you are installing on 3/4-inch
pipe, or 1-1/2 inches if you are installing on 1-inch pipe. Mark section of pipe to be removed.
5. Turn off the main water supply valve and open a faucet on the lowest level of you home to drain the system. Cut the
correct length of pipe. Use a pipe cutter or hacksaw. File or sand the ends of the pipe to make sure they are smooth
and square.
NOTE: Have a bucket handy to catch any water that may come out of the pipe.
6. Align filter assembly with ends of pipe, making certain cap opening marked "IN" is facing the incoming water supply. It
will be necessary to spread ends of pipe apart to install filter assembly. Using two adjustable wrenches, hold incoming
adapter securely with one wrench and tighten nut with second wrench. Repeat procedure for outgoing adapter.
Slowly turn on water supply to the filter and depress the red pressure-relief button on cap to release trapped air.
Check for leaks. Open the nearest faucet and flush for 10 minutes, wait one hour, then flush again for 10 minutes.
Risk of electrical shock. If your water pipes are used to ground your house's electrical system, install a No. 8 AWG
jumper wire (or larger) around the filter (see Figure 5). The jumper wire must be connected at both ends by a pressure
wire fitting or other connection that satisfies NEC or CEC and local codes.

FILTER CARTRIDGE REPLACEMENT

The cartridge's life depends on the water volume used and the substances
in the water. Normally the cartridge should be changed at intervals of 90
days or less. Replace it 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. NOTICE: Certain types of harmless bacteria will attack
cellulose material.
Cartridges containing cellulose, such as TO1 and RS1 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.
A) (1) Turn water off by rotating handle on top of housing in clockwise
direction.
NOTE: This will shut off all water flow within the household. Be sure to
fill a bucket of water first so you may clean housing after
it has been removed. (2) Remove bottom of housing by turning
clockwise.
B) Locate and remove large o-ring (3), wipe clean of lubricant and set
aside. Discard used cartridge (4). 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 (3) with clean silicone or plumber's
grease. Insert o-ring back into groove and smooth into place with
NOTE: This step is important to ensure proper housing seal. Make sure o-
ring is seated level in the groove.
Insert new cartridge (4) over standpipe in bottom of housing.
A
1
2
B
3
4
finger.
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