Owner Manual

Section 3: Glossary and Terms to Know
Add-On Kit (#ACL1): Filter add-on kit for adding additional in-line filters to an existing system.
It comes with quick-connect elbow fittings, filter clamps, and extra tubing
Alkaline Remineralization Filter* (#FA15): 6
th
stage. Remineralizes the RO water and
neutralizes the pH
Auto Flush Solenoid Valve (#ASOF7): Automatically flushes the RO membrane to preserve
membrane life and efficiency
Booster Pump (#PMP5): 24-volt booster pump used by residential iSpring RO systems
Check Valve (#ACV1K): One-way valve that does not allow water back into the membrane
housing. It looks like a standard fitting and is located on the RO water port of the membrane
housing
CTO Carbon Block Filter (#FC15): 3
rd
stage. 5-micron 10" carbon block filter. Further reduces
any residual chlorine, tastes, and odors before the water reaches the RO membrane
Drain Saddle (#ADS1): Attaches to your under-sink drain pipe to secure the drain tube coming
from the system
Drinking Faucet (#GA1-BN): The output source for the RO water. The faucet is a non-air gap
faucet with a 1/4" tubing connection. The optimally sized counter-top hole for the faucet is 1/2",
but holes up to approximately 1 1/2" will work
Elbow Fittings (#4044K): Quick connect elbow fittings used on the system (except the membrane
housing and cap). 1/4" tubing connection and 1/4" NPT male thread
Feed Water Adapter (#AFW43): It goes in line with your cold water line and branches off a
water supply line to the RO system. Can adapt to 3/8" and 1/2" cold water lines
Feed Water Solenoid Valve (#ASOW7): Opens the water supply to the booster pump when the
low-pressure switch and high-pressure switch are both on. Shuts off the water supply when one or
both turn off
Flow Restrictor (#AFR300): Limits the drain water flow, keeping pressure in the system and
allowing the RO process to occur
Flow Sensor Switch* (#FSS): Detects water flow to turn the UV filter on and off as needed
GAC Filter (#FG15): 2
nd
stage. 5-micron 10" granulated activated carbon filter. Reduces chlorine,
tastes, and odors from the water
GPD: Gallons Per Day
High-Pressure Switch (#AHP1): Receives pressure signals from the pressurized storage tank. It
turns on when the tank pressure is below 20 psi and turns off when tank pressure reaches 45 psi
(e.g., tank full)
Housing Wrench for Membrane Housing (#AWR1): Housing wrench used to screw on and
unscrew the membrane housing cap
Housing Wrench for Stages 1, 2, and 3 (#AWR2): Housing wrench used to screw on and
unscrew the stage 1, 2, and 3 filter housings
Ice Maker Kit (#ICEK): Add on kit that allows you to run water from the system to your fridge
ice maker or fridge water dispenser
Leak Stopper (#ALS1): Protects from any possible leaks by cutting off the water supply when the
sponge absorbs water
Low-Pressure Switch (#ALP1): Turns on when the source water pressure reaches 6 psi, turns off
when source water pressure drops below 6 psi
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