How do I know when it is time to clean the sand filter?
When the Pressure Gauge reads 0.25 Bar (3.5 PSI) or higher, or water flow returning to the pool is too low, it is time to clean the sand. As dirt builds up in the sand filter, the pressure reading on the Pressure Gauge will increase. To clean the sand bed, perform the Backwash and Rinse procedures. (Page 8)
From the official Bestway Flowclear 58515 Sand Filtration Pump Flow manual, page 8
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