25
Part I: RO BASICS
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. 16
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 “brine 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.
Fig. 16
APEC RO SYSTEM FLOW DIAGRAM
5th Stage UV Light
6th Stage Filter
7th Stage Filter
PRODUCT
WATER
TANK
FAUCET
MAIN
WATER
SUPPLY
FEED WATER
NEEDLE VALVE
MAIN WATER SUPPLY
SHUT-OFF VALVE
CARBON
PRE-FIL
TER
CARBON
PRE-FIL
TER
SEDIMENT
PRE-FIL
TER
2nd Stage
3rd Stage
1st Stage
CHECK VALVE
(BUILT IN)
4th Stage
R.O. MEMBRANE
PRODUCT WATER
IN
OUT
FLOW RESTRICTOR
(BUILT IN)
INLET
TANK
BALL
VALVE
AUTO SHUT-OFF
VALVE
DRAIN WATER
BRINE
25
Part I: R
R
O
O
B
B
A
SICS
This s
se
ection provides basic concepts on how an
an
R
RO
OES system works, how it perfo
o
rm
rm
s
s
in
in
r
r
e
elation to your
ho
o
us
us
e’
e’
s
s
water condition. We hope this in
in
fo
fo
rm
rm
at
atio
ion helps keep your ROES syste
m
m
ru
runn
nn
in
in
g at top
pe
pe
rf
rf
o
ormance 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 M
M
il
illi
li
o
on (unit used to measure TDS level)
TDS Meter = A
A
di
di
gi
gita
ta
l
l meter for measuring the TDS le
e
ve
vel
l
in
in t
th
he water
2) Flow D
D
a
iagr
gram
a
for 6-Stage RO System:
Fig.
g.
1
1
6
6
b
below shows how water flows throug
g
h
h th
th
e RO system from Feed point to Outpu
pu
t
t
point.
In
Inpu
pu
t
t water starts from Main Water Sup
uppl
pl
y
y,
g
oing through stages 1, 2, 3 pre-fi
i
lt
lt
er
ers,
s, t
th
hen enters the stage-4
me
m
mbrane. Product (filtered) water f
fro
ro
m
m
the membrane feeds the storage tank;
t
t
he
he
“
“brine water” from the
membrane drains out throug
g
h
h
th
th
e
e
dr
dr
ai
n line. Product water from the tank passes through stage-5 filter then
stage-6 filter before reachi
ng
ng the
he
d
dispensing faucet.
Fig. 16
APEC RO SYSTEM FLOW DIAGRAM
5th Stage UV Light
6th Stag
ag
e Filter
ter
PRODUCT
WATER
A
A
TANK
FAUCET
MAIN
WATER
A
A
SUPPLY
FEED WATER
A
A
NEEDLE VALVE
MAIN WATER SUPPLY
A
A
SHUT-OFF VALVE
CARB
ARB
ON
PRE-
PRE-
FI
F
LT
ER
CARB
ON
PRE
-
FI
LT
ER
S
EDIMEN
T
PRE-FI
LT
E
R
2nd Stage
3
3rd Stage
1st Stage
CHECK VALVE
(BUILT IN)
4th Stage
R.O. MEMBRANE
PRODUCT WATER
A
A
IN
OUT
FLOW RESTRICTOR
(BUILT IN)
INLET
TANK
BALL
VALVE
AUTO SHUT-OFF
VALVE
DRAIN WATER
A
A
BRINE
7th Stage Filter
