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Thread: Losing prime everytime we turn off pump....

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    Torsie's Avatar
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    Apr 2008
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    Losing prime everytime we turn off pump....

    Started a couple of days ago. Everytime we turn off the pump you can hear
    this big "whooshing" (for lack of a better term) noise and all of the water
    goes out of the pump basket. It's like we have to prime the pump when first
    starting up the pool. Takes a long time and then the pump basket will stay
    full and everything operates fine....until evening when we turn the pump off
    again and then "whoosh" the water is gone again.
    Any ideas or what other info I need to give for you guys to help?

    Thanks, Torsie
    NW Arkansas
    17,300 IG Gunite pool approx 16 yrs old (here when we bought the house in 2004)
    1.5 HP pump (rebuilt in '06)
    TA60 Tagelus Sand filter (sand replaced in '05)

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    Mod Squad Bama Rambler's Avatar
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    Re: Losing prime everytime we turn off pump....

    It sounds like air is getting into the filter and pushing the water out of the pump whenever you shut it off. Can you see air in the pump basket while the pump is running?

    There are a few common places where air usually gets into the system at.
    1. The pump strainer basket is the most common. Take it off and clean and lube the o-ring and sealing surfaces there.
    2. Check the skimmer to see if it's creating a vortex thereby sucking in air. If it is, try raising the water level in the pool
    3. Check the skimmer weir (flapper door) to make sure it's operating freely and not sticking.
    4. The pump drain plug. Remove the plug and clean the threads and t-tape them and thread it back into the drain.

    Temporarly until you find where the air is getting in at you can go out right before you turn the pump off and bleed out any air in the filter with the air bleed valve and see if the pump stays primed.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    lebanon tn
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    Re: Losing prime everytime we turn off pump....

    sounds like an air leak on the discharge side, letting all the water flow back to pool... look for any leaks while pump is running

    darn- I'm the slow typer today! What Bama said...
    24ft x 52in AGP 18000 gal
    sand filter, 200#,1.5 hp single speed pump
    Wood deck (still in progress...)

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    Re: Losing prime everytime we turn off pump....

    Mine was caused by an air leak around the pump skimmer basket and another at the plug/drain at the bottom of the skimmer basket. Once those were fixed, no more losing prime.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Torsie's Avatar
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    Re: Losing prime everytime we turn off pump....

    Thanks for the responses folks. We will check all of these things and hopefully something will
    help and it won't be a big deal.
    NW Arkansas
    17,300 IG Gunite pool approx 16 yrs old (here when we bought the house in 2004)
    1.5 HP pump (rebuilt in '06)
    TA60 Tagelus Sand filter (sand replaced in '05)

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    Kes's Avatar
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    Apr 2010
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    Worcester UK
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    Re: Losing prime everytime we turn off pump....

    And mine was caused by a disintegrating multi-port valve gasket. Now it holds for several hours.
    11,000 Imp galls inground hopper 15' x 35', Delifol liner (vinyl), sand filter, Abrisud Classic cover, Palintest 315C test kit

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    Torsie's Avatar
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    Re: Losing prime everytime we turn off pump....

    Okay folks. Thanks for your replies and we bought a new O Ring for the
    pump basket and so far we are not losing prime. Also, it was leaking some
    each time we turned it off and it no longer does that. Hopefully that takes
    care of our problem.
    Thanks everyone you're the best!!
    NW Arkansas
    17,300 IG Gunite pool approx 16 yrs old (here when we bought the house in 2004)
    1.5 HP pump (rebuilt in '06)
    TA60 Tagelus Sand filter (sand replaced in '05)

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    ThePoolNinja's Avatar
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    Southern California
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    Re: Losing prime everytime we turn off pump....

    Simple O-Ring Fix, nice! If you don't already have one, you may want to install a check valve as well. Good luck.

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