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This is normal with my DE filter. When I first turn the pump on the pressure starts at about 5 psi. During the next 30-60 minutes, it rises to 15 psi and then stablizes there. So, I use 15 psi as my "starting" pressure and don't backwash until it reaches 20 psi.

When was the last time you had the filter broken down and cleaned????

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18y ago

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