Why is it important to maintain the filter pressure within the recommended range?
When the pressure gauge exceeds 0.25 Bar (3.5 PSI), or if water flow to pool is too low, it signals dirt buildup in the sand filter and indicates that cleaning or backwashing of the sand is required (Page 8).
From the official Bestway 58515 Sand Filter Pump 3 028 L H Multi Colour manual, page 8
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