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Thread: Air coming through the returns

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    TarheelPool's Avatar
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    Mar 2007
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    Burlington, NC
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    Air coming through the returns

    Almost every time I clean out the pump basket, I get air bubbles through the returns when I restart the pump. This usually lasts for several minutes and then clears out. When I shut off the pump, I then turn off both skimmer valves and the main drain valve before I open the pump basket.

    Are the air bubbles normal or an indication of a potential problem?

    Thanks,

    Tarheelpool
    Foxx 18 x 36 IG Vinyl
    TR60 Sand Filter, Pentair Whisperflow 1hp
    Blue Pearl robotic cleaner

    Burlington, North Carolina

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    divnkd101's Avatar
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    As you are cleaning the basket, is the water draining from your pump??? If yes, that air has to go somewhere during startup. I normally do on mine. Hope that helps.
    MIKE

    21K Inground Custom w/ Spa (Gunite/Plaster), SWCG, Hayward Northstar, Polaris 280, Hayward Color Logics, Jandy PS-8

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    San Rafael, CA USA
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    This is perfectly normal.

    Even though you shut off the valves to the two suction pipes (skimmer and floor drain) there is still air introduced into the system when you open your basket. Remember that you first open the pressure relief valve before you open the basket lid and that lets some air into the filter. The basket lid being open also lets some air into the filter. With anything open to the filter, water is able to at least partially drain out to the returns. When you then close everything up and open the valves and turn on the pump, the pump primes (water comes in through the suction pipes) but the air in the basket and filter is pushed through to the returns.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    TarheelPool
    If the bubbles are short lived I dont see a problem. Most sand filters with the rotarty valve have a bleed valve on them. You might bleed some of the air off using this valve. You will loose some water in this process so unless it is a real anoyance I would just let the system prime it self. Also dont unscrew the valve too far or it will come off in your hand (had it happen to me).
    Steve
    Echo Canyon II by Artesian Pools, 13.5 KGal AG Round, 22" Artesian Sand Filter 2 hp Artesian pump
    Med Lab Tech for 12 years in E.TN
    Chem testing by Trouble Free Test Kits

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