Step 4: Install the Vertical Filters: Stages 1, 2, and 3
Step 4. a. Make sure that the O-ring is seated inside
the groove at the top of the filter housing. Food-
grade silicone jelly may help the O-ring stay in
place and seal better.
Step 4. b. Filter cartridges are preserved in shrink
wrap. Note the direction sign on the sticker before
removing the wrap (GAC stage).
Step 4. c. When placing the filter cartridge into its
housing, make sure it is centered, and the knob is
protruding from the bottom of the housing fits in
the central hole of the filter.
Step 4. d. Screw the housing, with filters attached,
onto the housing caps (caps are pre-assembled on
the machine head). The cap also has a center knob
that should be inserted into the center hole of the
filter cartridge. Twist the housing on in a
clockwise direction by hand, and then use a
housing wrench to tighten it up for about 1/4 – 1/2 turn. Do not overtighten. This can
cause leaks and make it difficult to unscrew the housing when replacing filters.
Step 4. e. Follow steps 4.a. – 4.d. to install the GAC and CTO filters. *Note* the second stage
GAC is the only filter that must go in a certain direction. Make sure that the end with the
rubber washer faces up, attaching to the housing cap.
Step 5: Install Tank Shut-off Valve (Optional)
Optionally, this RO system can be used with a 20 – 200 gallons storage tank. A tank helps meet the
impulsive high volume demand and build a commercial or whole house Reverse Osmosis solution.
1. Wrap 10 - 15 turns of Teflon tape clockwise (looking from the top) onto the metal thread at
the top of the tank.
2. Screw (clockwise) the Tank Shut-off Valve on and tighten it by hand. Do not overtighten.
3. An extra Tee fitting is needed for connecting the 5th stage, tank and filtered water faucet.
Step 6: Install Reverse Osmosis Membrane
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