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Thread: Pump Basket Draining when Shut Off

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    Pump Basket Draining when Shut Off

    I've read a lot about this problem but it's never quite my exact issue. Occasionally (not all the time), when my pump shuts off, water rushes out of the basket and into the pool (sometimes so forcefully that it bumps the skimmer cap off). This forceful rushing of water makes be believe there is pressure build up and not simply a leak allowing the water to flow back to the pool. This does not allow the pump to start up on its own as the prime is completely lost. This has only started after 2 months of troublefree operation. This happened last year as well. I get around this problem by, backwashing the filter, rinsing and setting it back to filter. After doing this, the pump basket will hold water without a problem. This trick works every time but I still run the risk of not catching the problem before it happens again.....and running the pump dry. So what is causing this??....air pressure trapped in the sand filer from a suction air leak? I imagined when backwashing, I am pushing all the air out of the filter, allowing the pump basket to hold water when shut off??? I don't have a air bleader on my Hayward sand filter. The mulitport valve appears to be leaking very slightly under the handle and I plan to change that out at the end of the year as it doesn't leak all the time. Yes, there are some small bubbles in the pump basket while operating. (something I might have to live with as it's an older inground pool with black poly and barb fittings on some of the junctions. Anyone who could shed some light on this intermittent problem is appreciated.

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Pump Basket Draining when Shut Off

    So what is causing this??....air pressure trapped in the sand filer from a suction air leak?

    That black poly pipe with those fittings is a prime suspect.

    Your filter is being pressurized by the suctions side air leak so those small bubbles you see going in the pump basket are being trapped in the filter and compressed. When the pump shuts off, that compressed air in the filter pushes your suction side water backwards out through the pump and skimmer, blowing your skimmer basket off.

    The ONLY fix is to find and stop that suction side leak. The good news is it is usually very inexpensive to fix but the bad news is it is often hard to find.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pump Basket Draining when Shut Off

    Wow...this site is fantastic. This was my first post. Thank you VERY much for the super speedy reply/advice!

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    Join Date
    Jul 2012

    Re: Pump Basket Draining when Shut Off

    You find out where the leak was?
    25k I/G ecostar ccplus Polaris plaster

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    Re: Pump Basket Draining when Shut Off

    I haven't found out where the leak was yet. I'm still in the peak pool swimming season and will likely do a little digging in September. I have confirmed it's not likely in the pump area. I suspect a barb fitting to black poly pipe is loose or cracked under the skimmer. I will dig up the area in a month and report back. Thanks for the interest in my problem.

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