Pentair AUTOTROL MAGNUM 298 - Recommended Backwash Flow Rates

Installer manual Autotrol Magnum 293 - 298 Logix 742-762 - System sizing
30 / 110 Ref. MKT-IM-012 / D - 03.02.2022
Flow control disc Insert 1 Insert 2 Insert 3 Insert 4
[gpm] [m
3
/h]
22 4.994 Green Green Red Black
23 5.221 Green Green Brown Black
24 5.448 Red Red Red Red
25 5.675 Green Green White Black
26 5.902 White White Green Black
27 6.129 White White White Black
28 6.356 Brown Brown Brown Brown
29 6.583 Brown Brown Brown Green
30 6.81 Orange Orange Orange Black
31 7.037 Green Green Green Brown
32 7.264 Green Green Green Green
33 7.491 Green Green Green White
34 7.718 Green Green Green Orange
35 7.945 White Green Green Green
36 8.172 White White White White
37 8.399 White White White Orange
38 8.626 Orange Orange Orange Green
39 8.853 Orange Orange Orange White
40 9.08 Orange Orange Orange Orange
Info
Drain line flow controls above 40gpm (9.08m
3
/h) require external control installed in
drain line.
4.1.3 Recommended backwash flow rates for various media
Media Tank diameter
14"
(35.6cm)
Tank
16"
(40.6cm)
Tank
18"
(45.7cm)
Tank
21"
(53.3cm)
Tank
24"
(61.0cm)
Tank
30"
(76.2cm)
Tank
36"
(91.4cm)
Tank
* Softening Resin
(5.0gpm/ft
2
)
(12.25m/h/cm
2
)
5 7 9 12 15 25 35
* Fine Mesh
Softening resin
(2.8gpm/ft
2
)
(6.86m/h/cm
2
)
3 4 5 7 9 14 20