2.3 RO Stage
Note that the RO housing on the bracket in Figure 1 (horizontal element on top
of the bracket) already contains a pre-installed 75 GPD (gallon per day) membrane.
There is no need to install the membrane, and when it is time to replace the membrane,
the whole element including the housing is discarded. Note that the fittings are the
"push-type" (John Guest type) to seal, and are easily disconnected from the tubing.
The tubing is color coded. Orange for feed water through the 2-pre-filters to the
auto-valve "IN" connection and from auto-valve "OUT" connection to the inlet of the
membrane housing. Then the clean water from the from the RO is a white line to the
auto-valve and from the auto-valve to the tank (yellow tubing is provided). The reject
or brine line from the RO is colored black and connects to the sewer line under the sink.
2.4 Connecting the feed water supply (Fig. 2)
The feed water assembly consists of 1/2” brass slip joint adapter, a black wash-
er, and a 1/4” x 1/4” ball valve. Locate these parts in the installation kit.
Locate the cold water shut off valve under the sink and turn it off. Open the cold
water faucet to release the pressure. On single handled faucets, the hot water may
have to be turned off to prevent any hot water cross-over. If water continues to come
out of the faucet with the under-sink valves turned off, the house main valve will have
to be turned off.
Now that the water has been turned off, disconnect the cold water riser tube (flex
line) from the valve. Install the slip joint connector with the black washer. Loosen the
nut and separate the cold riser tube from the faucet shank. Gently bend the riser tube
so that the slip joint adapter fits onto the faucet shank. Reinstall the cold riser tube on
the slip joint connector using the existing cone washer. For Solid copper tube the pro-
cedure is the same except you must cut a piece of the riser tube about 3/4” to 1” so
the slip joint adapter can fit between the valve and the riser tube. Wrap several turns
of teflon tape on the ball valve and install on the slip joint connector.
In some cases the Pure Water Machine is supplied with a saddle Valve which can
clamp over a copper pipe and make the hole and seal at once. (See figure 3).
Figure 2
Figure 3
– 4 –
Existing Cold Water
Line to Sink
1/4” Tubing
(orange)
Ball Valve
Rubber
Grommet
1/2” Slip Joint
Adapter
Black Washer
Existing Cold Water
Supply Valve
Nut
Valve with
Piercing Point
1/4” Feed
Clamp
Copper
Water
Line
