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Cleaning the pool filter sand


After about 5-10 days, or when the reading of the pressure gauge on the pump side of the filter has increased by about 0.2 bar (20 kPa, 3 psi) since the last backwash, backwash the filter as follows:


Stop the pump.

  1. Close the valves on the suction and return lines.
  2. Open the cover of the pump and empty the filter basket.
  3. Refit the cover.
  4. Open the valve to the drain outlet.
  5. Turn the lever to BACKWASH.
  6. Open the valves to the suction and return lines.
  7. Start the pump. Rinse the filter for about 1 to 2 minutes or until the water in the sight glass is clear. NOTE: Any electric heater must be off.
  8. Stop the pump.
  9. Turn the lever to RINSE, start the pump and rinse for about 15-30 seconds. Stop the pump and turn the lever to FILTER. This is the normal operating position.
  10. Close the drain outlet valve and start the pump. Switch on the electric heater if any.


Positions of the backwash valve


FILTRATION Normal filtering position.
BACKWASH Cleaning the filter sand.
RINSE Stabilizing the filter sand.
WASTE For vacuum cleaning the bottom of the pool directly to drain, or for emptying the pool.
CLOSED Closed.
CIRCULATION Pumping water directly to the pool (no filtering).


Pahlén bronze valve for sand filter