When should I clean the sand bed and how do I know it's time?
You should clean the sand bed when the Pressure Gauge reads 0.25 Bar (3.5 PSI) or higher, or when water flow to the pool is too low. A weekly check is recommended for backwashing or cleaning. To clean the sand bed, perform the Backwash and Rinse procedures as outlined in the manual. (Page 8)
From the official Bestway 58515 Sand Filter Pump 3 028 L H Multi Colour manual, page 8
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