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Recommended Backwash Flow Rates for Various Media
Table 13 Recommended Backwash Flow Rates for Various Media
14 in
Media
(35.6 cm)
Tank
*Softening Resin
2
(5.0 gpm/ft
)
2
(12.25 m/h/cm
)
*Fine Mesh
Softening Resin
2
(2.8 gpm/ft
)
2
(6.86 m/h/cm
)
Multi Layer
2
(15 gpm/ft
)
2
(36.75 m/h/cm
)
Birm, Greensand,
Carbon
2
(10 gpm/ft
)
2
(24.5 m/h/cm
)
o
o
*50
F (10
C) water temperature, 50% bed expansion
16 in
18 in
(40.6 cm)
(45.7 cm)
Tank
Tank
Drain Line Flow Control in GPM
5
7
9
3
4
5
15
20
25
10
15
17
Tank Diameter
21 in
24 in
(53.3 cm)
(61.0 cm)
Tank
Tank
12
15
7
9
36
50
25
30
51
30 in
36 in
(76.2 cm)
(91.4 cm)
Tank
Tank
25
35
14
20
70
105
50
70
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