Culligan High Efficiency 1.5 Twin Series Installation, Operation And Service Instructions page 55

Backwash
Raw water is directed down the center of the manifold, up through the resin, out the top of the tank to drain. The water to
drain should be hard.
Raw
Water
Cat. No. 01024821
P1
P6
P2
P3
Figure 54. Down flow regeneration—backwash.
Backwash
Piston
P1–Inlet
P2/3–Outlet
P4–Backwash
P5–Rinse
P6–Bypass
Brine Piston
PR–Refill
Tank
Inlet
P4
Brine
Piston
PR
P5
Tank
Outlet
Position
Closed
Open
Open
Closed
Open
Closed
Closed
To
Drain
To
Brine
Tank
Hard Water
Softened Water
Drain
Brine
Diluted Brine
Troubleshooting 51