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Thread: running low speed - air in pump basket

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    running low speed - air in pump basket

    Hi: Converted my Superpump 1hp to a 1hp 2 speed this spring... works great! My question is... why am I getting a bit of an air bubble in my pump basket when I run it on low speed? The air bubble seems to grow a little bit if I run it continuously for a day or so. Water seems to be moving fine, no air coming out of returns, and there is never any air in the pump basket when I run it on full speed. Just trying to figure out if there is some kind of problem here or not. Thanks.
    10,000 IG vinyl liner pool, Hayward sand filter, Hayward SuperPump (converted to 2-speed), BBB user

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    Mod Squad Bama Rambler's Avatar
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    Re: running low speed - air in pump basket

    It could be that you have a small air leak (lube the pump basket o-ring) and on low it doesn't expell the air but on high it does. Also on low you won't have as much negative head so it could possibly leak more on low than on high.
    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
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    Re: running low speed - air in pump basket

    It's a new lid gasket, but I'll lube it and see what happens.
    10,000 IG vinyl liner pool, Hayward sand filter, Hayward SuperPump (converted to 2-speed), BBB user

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    Mod Squad Bama Rambler's Avatar
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    Re: running low speed - air in pump basket

    That was just a memory jogger in case you hadn't remembered to do it. It could be a leak in the plumbing or where the basket connects to the pump, etc.
    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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    JasonLion's Avatar
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    Re: running low speed - air in pump basket

    Having a relatively small air bubble, compared the the size of the entire strainer basket, isn't a problem as long as the pump doesn't lose prime because of it. It might be normal, or it might be a sign that there is an air leak that might get worse.
    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

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