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Thread: An "O" ring question for a pre filter

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    An "O" ring question for a pre filter

    My pre filter on my Hayward pump keeps sucking air.

    I've got the lid pretty tight and use silicon/Teflon pool gasket lube but it still leaks a bit. In fact, often when I shut it off back pressure squirts some out the lid. (I also have roof solar).

    I can't really hand tighten it any more than it is because a pipe is in the way, and I use that special wrench to take the lid off. I'd like a better gasket.

    Sooo.... I'm thinking of buying a fatter "O" ring on Amazon or somewhere. On a site I visited, an O ring was described as: 7.8 x 5.8 x 0.2 inches. Is the first number a measurement of the span over two pegs for example? (I need to mic mine to get the right dimensions). And what hardness should I be looking for? (AKA durometer) and what material should I look for that is compatible? I'd hate for it to break down and glue my lid shut!

    Thanks in advance
    SWG: CircuPool (May 2014) SI30+Plus; 3000ppm seems ideal;
    My Ideal Specs:
    FC 5; PH 7.4-7.6; TA 90; CH 350; CYA 75; = SI ~ 0.19
    14,000 gal, in ground, plaster, Cartridge filter, Borates
    TAYLOR K - 2006

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    Mod Squad kimkats's Avatar
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    Re: An "O" ring question for a pre filter

    Have you used lube tube on it? It will look like this.

    Amazon.com : Lube Tube - Pool Gasket Lubricant : Swimming Pool Water Pumps : Patio, Lawn Garden

    This will help it seal! You can buy it pretty cheap in pool stores.

    Good luck.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: An "O" ring question for a pre filter

    What are you calling the pre-filter? The pump strainer basket? If so, DO NOT tighten it anymore. It does not rely on mechanical tightness to hold it in place....it relies on suction.

    Make absolutely sure that's where your leak is (check the drain plugs on the bottom) and if that's where it is, buy a new gasket, put it on and report back.

    Do not tighten it other than hand tight.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: An "O" ring question for a pre filter

    Yes. Pump strainer basket.

    I do use that lube. I'll get a new gasket, asap. I just get the feeling that a fatter O ring would do a better job.
    SWG: CircuPool (May 2014) SI30+Plus; 3000ppm seems ideal;
    My Ideal Specs:
    FC 5; PH 7.4-7.6; TA 90; CH 350; CYA 75; = SI ~ 0.19
    14,000 gal, in ground, plaster, Cartridge filter, Borates
    TAYLOR K - 2006

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    Re: An "O" ring question for a pre filter

    I just get the feeling that a fatter O ring would do a better job.
    Of course, the manufacturer will design the 0-ring to fit the space correctly. Is it possible the incorrect 0-ring is in there?

    Regardless, if you KNOW the leak is there, the correct 0-ring will likely fix it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: An "O" ring question for a pre filter

    I changed the filter and all is well.

    Seems strange to me but it worked. I'll be changing the o ring soon.
    SWG: CircuPool (May 2014) SI30+Plus; 3000ppm seems ideal;
    My Ideal Specs:
    FC 5; PH 7.4-7.6; TA 90; CH 350; CYA 75; = SI ~ 0.19
    14,000 gal, in ground, plaster, Cartridge filter, Borates
    TAYLOR K - 2006

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    Re: An "O" ring question for a pre filter

    Do you remember the psi when you had the old filter in? What is it now with the new filter?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: An "O" ring question for a pre filter

    The old filter was ~ 18 - 20 psi when clogged, no solar water panels enabled. The new filter runs ~ 7 - 10 psi without the solar water panels enabled.

    It seems odd to me that pressure forward of the pump would create more suction aft of the pump.. Hmmm... either way a few bubbles are not a big deal, just an annoyance.
    SWG: CircuPool (May 2014) SI30+Plus; 3000ppm seems ideal;
    My Ideal Specs:
    FC 5; PH 7.4-7.6; TA 90; CH 350; CYA 75; = SI ~ 0.19
    14,000 gal, in ground, plaster, Cartridge filter, Borates
    TAYLOR K - 2006

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