How do I properly backwash my sand filter?
To backwash, set the Control Valve to Backwash and run for 3-5 minutes or until water runs clear. Then switch off the pump and move valve to Rinse mode, running for 1 minute before switching off again and setting it to Closed position (Page 8).
From the official Bestway 58515 Sand Filter Pump 3 028 L H Multi Colour manual, page 8
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