Owner Manual

Understanding the Booster Pump and RO Process
1. Source water enters the system and
passes through the stage 1, 2, and 3 pre-filters.
Located between the pre-filters is the Low-
pressure Switch. This switch turns on when
the incoming water pressure is 6 psi or greater.
2. The High-pressure Switch turns on
when the pressure from the pressurized tank is
below 20 psi, and turns off at 45 psi (e.g., when
the tank is full).
3. When the Low-pressure Switch and
High-pressure Switch are both on, the Feed
Water Solenoid Valve opens, allowing water
to the Booster Pump.
4. The source water passes through the
Booster Pump, bringing it to approximately 135
psi entering the membrane housing.
5. Coming out of the RO membrane is a
pure water port and wastewater port. The RO
water is forced through the .0001 micron-sized
holes of the RO membrane and exits through
the one-way Check Valve on the membrane’s
pure water exit port. The water rejected by the
RO membrane exits through the wastewater
exit port. On the drain line before the
wastewater is disposed of is the Flow
Restrictor, limiting the amount of drain water
allowed out to keep pressure in the system.
6. The pure water is then routed to the
pressurized storage tank. As the storage tank
fills, the tank pressure rises. When the
pressurized storage tank reaches 45 psi, the
tank pressure triggers the High-Pressure Switch
off, shutting the booster pump and system off.
7. When you open the RO faucet, the
water exits the tank, passes through the FT15
post-carbon filter, and is dispensed from the
RO faucet. As the RO water is dispensed, the
tank pressure will gradually drop back down,
triggering the High-Pressure Switch back on to
refill the water removed from the tank.
www.123filter.com | [phone] | [e-mail] Page 5