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Construction of the manifold system
To construct the manifold system seen here, use only schedule 40 PVC pipe and fittings to construct it. Shown
below is an illustration of the manifold setup in filter position. Always support the long runs of PVC pipe to prevent
any added stresses on the filter bulkheads and glue joints and use as short of runs of PVC pipe as possible. Minimize
the number of fittings and elbows used in the system. This will reduce pressure drop in your system and improve
efficiency.
For pipe lengths and parts numbers see the table below:
Table: Pipe Lengths and Part Numbers
I
E T
M
N
O
.
1
1
1
1
2
2
2
2
3
4
5
6
7
8
How to Configure a 3-way Valve
The 3-way backflush valves need to be re-configured prior to construction of the manifold system. In order to re-
configure the 3-way backflush valves, please follow these steps:
1. Remove the set screw from both of the valves.
2. Remove the two set-pins from the valve handle assembly.
3. Rotate the valve handle 180° from its original position. The word "OFF" should now be in line with the tee outlet
of the valve.
4. Replace the set screw in both of the valves.
5. Replace the set-pins as follows:
a. Right-hand valve: L-90 positions
b. Left-hand valve: R-90 positions
1
2
6
7
D
S E
C
R
P I
I T
O
N
P
V
C
P
P I
E
S
C
H
4
0
P
V
C
P
P I
E
S
C
H
4
0
P
V
C
P
P I
E
S
C
H
4
0
P
V
C
P
P I
E
S
C
H
4
0
P
V
C
P
P I
E
S
C
H
4
0
P
V
C
P
P I
E
S
C
H
4
0
P
V
C
P
P I
E
S
C
H
4
0
P
V
C
P
P I
E
S
C
H
4
0
P
V
C
P
P I
E
S
C
H
4
0
P
V
C
P
P I
E
S
C
H
4
0
E T
E
" 2
L S
P I
x
L S
P I
x
L S
P I
E
B L
O
W
" 2
9
0
D
E
G
S
X
S
- 3
W
A
Y
V
A
L
V
E
" 2
P
V
C
" 2
U
I N
O
N
S
T E
3
4
5
M
O
D
L E
E L
N
G
T
H
/
P
A
A
C
4 -
0
5
7 .
5
" 0
A
C
6 -
0
8
3 .
7
" 5
A
C
1 -
0
0
1
1
3 .
7
A
C
1 -
4
0
1
4
3 .
7
A
C
4 -
0
1
5
5 .
0
A
C
6 -
0
1
8
1 .
2
A
C
1 -
0
0
2
1
1 .
2
A
C
1 -
4
0
2
4
1 .
2
A
L L
1
5
5 .
0
A
L L
5
7 .
5
" 0
A
L L
1
9
2
7
8
A
L L
1
5
2
2
6
A
L L
2
6
3
0
2
A
L L
2
7
1
0
9
Aqua-Clear
™
Fiberglass Sand Filter Installation and User's Guide
8
T R
N
O
.
Q
Y T
N
E E
D
E
D
2
2
" 5
2
" 5
2
" 0
2
" 5
2
" 5
2
" 5
2
" 0
1
2
2
3
5
5
6
2
2
2
5
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