How do I prepare the sand filter for first-time use?
Before first use, you must perform a Backwash and Rinse cycle to wash the sand. Set the Control Valve to Backwash, run for 3–5 minutes until water runs clear, then switch to Rinse and run for 1 minute. After rinsing, switch off the pump, set the valve to Closed, and top up pool water if needed. (Page 8)
From the official Bestway 58515 Sand Filter Pump 3 028 L H Multi Colour manual, page 8
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