24
APEC RO SYSTEM FLOW DIAGRAM
5th Stage Filter
6th Stage Filter
PRODUCT
WATER
TANK
FAUCET
MAIN
WATER
SUPPLY
FEED WATER
NEEDLE VALVE
MAIN WATER SUPPLY
SHUT-OFF VALVE
CARBON
PRE-FI
LT
ER
CARBON
PRE-FI
LT
ER
SEDIMENT PRE-FI
LT
ER
2nd Stage
3rd Stage
1st Stage
CHECK VALVE
(BUILT IN)
4th Stage
R.O. MEMBRANE
IN
OUT
INLET
TANK
BALL
VALVE
AUTO SHUT-OFF
VALVE
TO DRAIN PIPE
PRODUCT WATER
FLOW RESTRICTOR
(BUILT IN)
BRINE
Fig. 15
This section provides basic concepts on how an ROES system works, how it performs in relation to your
house’s water condition. We hope this information helps keep your ROES system running at top
performance for years to come.
1) Basic Terms
GPD = Gallons Per Day (flow rate)
PSI = Pounds per Square Inch (pressure)
TDS = Total Dissolved Solids (contaminants)
PPM = Parts Per Million (unit used to measure TDS level)
TDS Meter = A digital meter for measuring the TDS level in the water
2) Flow Diagram for 6-Stage RO System:
Fig.15
below shows how water flows through the RO system from Feed point to Output point.
Input water starts from Main Water Supply, going through stages 1, 2, 3 pre-filters, then enters the stage-4
membrane. Product (filtered) water from the membrane feeds the storage tank; the “discharge water” from
the membrane drains out through the drain line. Product water from the tank passes through stage-5 filter
then stage-6 filter before reaching the dispensing faucet.
Important!
Please TURN OFF the main cold water supply to the RO system when the unit is not in use dur-
ing a vacation or extended leave. During very cold or freezing weather conditions, please also TURN OFF
the main cold water supply and completely drain all of the water from the RO system and water storage
tank.
Part I: RO BASICS
