APEC R.O. System Filter Change Instruction
Add a little bit lubricant on double o-rings.
Changing Stages 1, 2, 3 Pre-Filters: (should be changed at least every 12 months)
1) Turn OFF cold water supply to RO system. Turn OFF the tank ball valve by turning the blue handle 90 degrees. 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 #1 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
housing 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 thread groves. Use wrench to tighten each
housing.
5) Remember: Turn ON the cold water supply and OPEN the tank valve after finished changing filters!
6) Check for leaks!
Turn counter-clockwise to
open the membrane
housing cap.
Fig. A1
After Taking the housings off, take out the dirty
filters and put the new 3 pre-filters in. Remember,
Stage-2 and Stage-3 are the same carbon filters.
Fig. A2
Changing Stage-4 Membrane: (should be changed every 3-5 years)
1) Turn OFF the cold water supply to RO system. Turn OFF the tank ball-valve. Turn on RO faucet briefly to relieve 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 tubing from the housing’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. Remove the used mem-
brane. Discard. Empty water from housing. Insert the new membrane using a pair of pliers. Push membrane into housing
tightly. Avoid touching the Membrane with your hands to prevent contamination!
Correct direction
3) 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!
4) Close the housing cap. Reconnect the RED or WHITE tubing to the cap. Turn on the cold water supply and open the tank
valve. Let the RO system run to re-fill the tank (takes about 2-3 hours).
5) Check for leaks!
6) Drain the first tank of water (through faucet) to flush out the new membrane! The 2nd tank of water is ready for use.
Changing Stage-5 Carbon TCR Filter: (should be changed every 3-5 years with Membrane)
Top View
Fig. B
1) Remove the OLD filter: See Fig. B. Disconnect the Input tubing from point J and Output tubing from
point H. To remove the 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. Unclip the filter from the membrane housing and discard
the used filter.
2) Sanitize: Use some mild bleach solution to rinse the 2 tubing ends, and the 2 ports of the new filter. This is to
prevent contamination.
3) Install NEW Filter: Put the filter back onto the membrane housing. Make sure the “FLOW ” on the filter is
pointing to the pure water output direction.
NOTE: The QC filter will come with 2 end plugs.
Please remove both end plugs before
reattaching tubing. See Fig. C.
Fig. C
4) Connect the Tee fitting on the Inlet (J) of the filter. Push the tubing into the QC fitting on the filter, then gently
pull back on make sure connection was secure. Lastly connect pure water output line to Outlet (H) on filter.
5) Check for leaks!
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