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Thread: Check valves?

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    guamguy's Avatar
    Join Date
    Feb 2010
    Guam, USA

    Check valves?

    OK, this may be a dumb question, but my sand filter drains all the water into the pool every time I shut the pump off. Should I add a check valve to the plumbing and where should I put it? I thought it was a problem with the multiport valve for the filter, but I opened it up, and there is nothing wrong in there. Is it normal for the filter to drain when the pump shuts off?
    12,800 gallon IG plaster kidney-shaped pool, waterslide, 800 gallon spa.
    1HP 2 speed Sta-Rite pool pump, 1.5 HP Sta-Rite spa jet pump. 2 skimmers, 1 main drain
    Purex-Triton TR-60 325 lb.sand filter. 2" Plumbing, Intex SWCG, TF-100 test kit.
    Link to pics of my pool!

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Check valves?

    When the filter drains down every time the pump turns off it means you have a leak in the plumbing somewhere. You need to locate and fix the leak.

    Adding a check valve would somewhat mitigate the problem, but it would also slightly reduce the efficiency of your system. It is much better to find the leak and not bother with the check valve.

    The leak could be almost anywhere. The first place to look is the lid of the pump strainer basket. Make sure the o-ring is in good shape and the lid is sealing properly. After that you need to look for places water is spraying out when the pump is running.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Check valves?

    You have an air leak.....most likely on the suction side. Once you find that leak (it'll take some detective work) your filter will not drain.

    EDIT: ditto what Jason already posted
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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