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Thread: Pump sucking air

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    Pump sucking air

    Hi, bought a home last November with a 15 by 35 fiberglass 22,500 gallon pool. Found TFP for advice on water chemistry and have a sparkling clear pool. Problem I'm having is with the pump sucking air. There's been a few times basket runs full but most of the time it's not. I've looked all around lid and basket housing for leaks or cracks when I shut pump off and can't find anything. It's a 1 hp motor and sta-rite 240 sand filter. Impeller is clean. Any advice? Thanks



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    duraleigh's Avatar
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    Re: Pump sucking air

    Welcome to the forum


    Have you seen the article in Pool School?

    Pool School - Suction Side Air Leaks
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pump sucking air

    Just did now thanks. Sometimes it will run full for 20 seconds and then fill with air.

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    Richard320's Avatar
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    Re: Pump sucking air

    Quote Originally Posted by Terrys379 View Post
    Just did now thanks. Sometimes it will run full for 20 seconds and then fill with air.
    Does it surge? That's a good sign your water level is too low, either because it's low in general or because the skimmer weir is sticking. Take a look inside the skimmer and check for a vortex. What happens is that the pump primes, gets going so well that it sucks the water out of the skimmer, loses prime, stops pumping, which allows skimmer to refill, it primes, gets going good.... and so on.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Pump sucking air

    It's not surging. Plenty of water in skimmer and the vortex is small.



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    Richard320's Avatar
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    Re: Pump sucking air

    Quote Originally Posted by Terrys379 View Post
    It's not surging. Plenty of water in skimmer and the vortex is small.
    Shouldn't be a vortex at all.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Pump sucking air

    Found air leak 3 ft from pump underground fitting.



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    Richard320's Avatar
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    Re: Pump sucking air

    Quote Originally Posted by Terrys379 View Post
    Found air leak 3 ft from pump underground fitting.
    Excellent!
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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