APEC RO-PH90 System Filter Change Instruction
3rd
Stage
2nd
Stage
1st
Stage
STEP1 STEP2
Use
Wrench
W
W
Option: Recommend to add a little bit lubricant on double o-rings.
After Taking the housings off, take out the dirty
filters and put the new 3 pre-filters in. Remember,
Stage-2 and Stage-3 use the same carbon filters.
Fig. A2
Fig. A1
Correct direction
Turn counter-clockwise to
open the membrane
housing cap.
Changing Stages-1, 2, 3 Pre-Filters: (should be changed at least every 6-12 months)
1) Turn OFF cold water supply to RO system. Turn OFF the tank ball valve. Turn on RO faucet lever briefly to relieve the built-
up pressure inside the RO system. This will make opening the housings easier.
2) Open housing: Have the RO standing upright. Slip the plastic wrench onto the 1st housing. Looking down from a top view,
you should open the housing turning clockwise. If necessary, lay RO down on the floor to get a better leverage. If the hous-
ing is too tight, use a hammer and gently tap on the wrench handle to help turn the wrench.
3) Discard 3 used filters, wash housings with mild soap, rinse off. Put 3 new filters into their respective housings: sediment filter
in stage-1, carbon block filters in stages 2 & 3.
4) Close up the housings. Make sure each housing has a black O-ring in the threaded groves. First hand tighten the housing,
then use filter wrench to fully tighten each housing. Do not over-tighten.
5) Keep tank ball valve CLOSED and Turn ON the cold water supply as well as RO faucet lever. Please let purified water
run for 10-15 minutes to relieve built-up pressure inside the RO unit.
6) Turn OFF the RO faucet lever and Turn ON the tank ball valve.
7) Check for leaks!
Changing Stage-4 Membrane: (should be changed every 2-3 years)
1) Turn OFF the cold water supply to RO system. Turn OFF the tank ball valve. Turn on RO faucet lever briefly to relief the
built-up pressure inside the RO system. This will make opening the housings easier.
2) See Fig. B. Locate the Membrane housing on the system (labeled “Membrane”). Remove the WHITE tubing from the hous-
ing’s cap at point D. To remove tubing, Push In and Hold Down on the collet ring square against the fitting. With the collet
held in this position the tube can be removed. Open up the cap (turn counter-clockwise) see Fig. A1. Using a plier, remove
the used membrane for disposal.
3) Once the membrane is removed, please tilt the RO system at an angle to drain out residual water from inside of the mem-
brane housing and insert the new membrane using a plier. Push membrane into housing. Avoid touching the Membrane
with your hands to prevent contamination.
4) Important! Make sure the “double-ring” end of the membrane goes into the housing first as shown in Fig. A2. above. The
membrane cannot filter water if it’s inserted in the WRONG direction!
5) Close the housing cap. Reconnect the WHITE tubing to the cap. Turn on the cold water supply and tank valve. Let the RO
system run to re-fill the tank (takes about 2-3 hours).
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