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Thread: backwash

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    When do I need to backwash?

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    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina

    Re: backwash

    When filter psi rises about 20 to 25% above clean filter psi.

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: backwash

    Welcome to TFP!

    It depends on what kind of filter you have. Cartridge filters are not backwashed. Only some DE filters can be backwashed, but all sand filters required periodic bakwashing. General guidance is at a 25% rise from normal pressure, but I tend to just backwash mine whenever I need to get rid of rainwater from the pool.
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