11
HOW THE RO SYSTEM WORKS
PREFILTER
Water from the cold supply pipe enters the RO assembly
sediment prefilter first. The replaceable sediment car-
tridge reduces chlorine, sand, silt, dirt, other sediments to
clean the feed water before entering the RO cartridge and
postfilter.
REVERSE OSMOSIS (RO) CARTRIDGE
The cartridge, inside the RO housing, includes a tightly
wound, special membrane. Water is forced through the
cartridge and the membrane reduces the dissolved solids
and organic matter. High quality product water exits the
RO housing and goes to the storage tank, or to the post-
filter and RO faucet. Reject water, with the dissolved
solids and organic matter, is routed through the flow con-
trol and to the drain.
STORAGE TANK
The storage tank holds product water. A diaphragm
inside the tank keeps water pressurized when the tank is
full, to provide fast flow from the RO faucet. The tank is
charged with 5-7 psi air.
POSTFILTER
After leaving the storage tank, but before going to the
RO faucet, product water goes through the postfilter. The
postfilter is an activated carbon type filter. Any remain-
ing tastes, odors and sediments are reduced from the
product water. Clean, high quality drinking water is
available for use.
FAUCET
The sink or countertop faucet vends the drinking water
when opened. It is opened and closed by turning the
knob. To comply with plumbing codes, an air-gap is built
into the faucet drain water connection.
SHUTOFF ASSEMBLY
To conserve water, the drinking water system has an
automatic shutoff system. When the storage tank has
filled to capacity, and the drinking water faucet is closed,
pressure closes the shutoff to stop flow into the RO.
After drinking water is used, and pressure in the system
drops, the shutoff opens to allow water flow again.
CHECK VALVE
A check valve is located in the RO manifold, above the
center sump. The check valve prevents a backward flow
of product water from the storage tank. A backward flow
could rupture the RO membrane.
FLOW CONTROL
Water flow through the RO membrane is regulated by the
flow control. It maintains the desired flow rate to obtain
the highest quality drinking water. The flow control is
located in the 1/4" red drain tube. A small cone-shaped
screen fits over the end of the flow control to help pre-
vent plugging with drain water sediments.
