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The Aqua Select® Pressure Gauge serves as a suitable replacement unit for any pool filter (sand, cartridge or DE) that requires a side or top mounted pressure gauge. The pressure gauge accurately measures the pressure inside your filter tank, which steadily increases as the filter takes in more and more debris.
Pressure Gauge Tip:
When the pressure of your filter has increased by 8-10 psi from your starting pressure, it's time to backwash your filter or clean your cartridge.