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Thread: Filter keeps loosing pressure

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    Filter keeps loosing pressure

    I back wash the filter ( DE starite ) and the pressure drops to 12 - 15. It stays like that for approximately 1-2 hrs., then it gose up to 30 - 35, and it stops sucking water into skimmer and push water out of jets. I back wash it and it dose the same thing over again, I am running out of D E.

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    JasonLion's Avatar
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    Re: Filter keeps loosing pressure

    Welcome to TFP!

    What does the water look like?

    The behavior you describe is completely normal if you have algae, or are in the process of cleaning up dead algae.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Filter keeps loosing pressure

    Yes the pool was green, and I'm in the process of cleaning it, do I have to keep back washing the filter and adding DE to it.

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    Butterfly's Avatar
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    Re: Filter keeps loosing pressure

    Quote Originally Posted by Bano67 View Post
    Yes the pool was green, and I'm in the process of cleaning it, do I have to keep back washing the filter and adding DE to it.
    Yes, and you should backwash when the filter pressure increases 25% above clean filter pressure.
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    Re: Filter keeps loosing pressure

    Thanks your guys r gr8

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    Richard320's Avatar
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    Re: Filter keeps loosing pressure

    What brand of filter are you using? What you're describing is a great testimonial to its efficiency!

    If your filter has a rotary multiport valve, you might want to set it to recirculate if you leave the pump running and you won't be around to keep an eye on the pressure rise.

    And when the pool is all clean and sparkling, you probably will want to do a full teardown and cleaning. Instructions.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    frustratedpoolmom's Avatar
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    Re: Filter keeps loosing pressure

    I agree, if you can set to recirculate while you SLAM (see Pool School) you won't have to worry about the pressure rise. The dead algae should sink to the bottom then you can vacuum to waste... if you don't have a multiport valve, the process a bit more tricky....

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    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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