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Thread: Air in the filter. What does it mean?

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    Air in the filter. What does it mean?

    Lately I've been noticing air building up in my filter. When I open the little valve on top, I get about 5-10 seconds of air coming out before the water starts flowing. It seems to be about the same amount of air whether I crack the valve once a day or once a week which suggests to me that there's a certain maximum volume of air that builds up in there and once it's reached, no more new air enters.

    I don't know if that makes any sense. But like I said, if I check it once a day or once a week, the amount of air coming out seems about the same.

    Any idea what's happening here and why? Should I be concerned?

    I'm running solar heating which may(?) contribute to air leaks in the system

    Thanks!
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Re: Air in the filter. What does it mean?

    Can you see air bubbles in the pump strainer basket? (pump running)

    If you shut the pump off, how long will it hold prime?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Air in the filter. What does it mean?

    I don't recall seeing any bubbles, but I'll check when I get home.

    Not sure about holding prime either. But maybe this is related.......when the pump kicks on in the morning, it runs for 30 seconds to a minute before any pressure is built up or any water starts flowing. When I look down into the strainer basket, I see water way down at the bottom, but the basket is empty.
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Re: Air in the filter. What does it mean?

    If your pump basket is full of air, you are leaking somewhere. As this is an in-ground, I can assume your pump and its basket are above the water level so i would start by adding o-ring lube to the gasket on your pump strainer lid. It may be as simple as the water from your pump is draining back to the pool due to an air leak in the lid. This is most likely source in my mind, assuming you have not damaged any of your suction piping.
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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    Re: Air in the filter. What does it mean?

    It is possible if you are not seeing air in the pump basket when the pump is up and running, that the leak is up in the filter. When the pump shuts off, the filter leak allow air in which lets the filter and pump drain down.

    So, are you sure that the air builds up while the pump is on? Or is it possible that the air enters the system when the pump is off?
    Jason, TFP Moderator
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    Re: Air in the filter. What does it mean?

    Any leak on the pressure side of the system with the pump running will result in visible water...pretty easy to find.

    It is almost surely a suction side air leak. Why it builds to a point and stops, I'm not entirely sure. My guess is it reaches a point within the filter where it can be blown out through the return so OP should see bubbles coming out of the return after a while.

    Anyway, whether it stops or not, the source of the leak can be found somewhere between the skimmer and the pump and it is simply gonna' take detective work to ferret it out. Always start with the O-ring being seated properly and in good shape.....that's the most common spot.

    (your solar is on the pressure side....that's not it)
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Air in the filter. What does it mean?

    I forgot to mention, I had to replace my pump's lid a couple years ago due an unresolved leak. New lid, new lubed gasket, problem solved.... but my leak was easy to see with the pump basket being below the water level, it was always under pressure and when the pump started, the basket would fill with air and lose prime. AGP pumps are not self priming and require a full basket or they simply pump air, cavitate and get hot (and die).
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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    Re: Air in the filter. What does it mean?

    Thanks folks. Great stuff. I'll do some investigating and check back in.
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    Re: Air in the filter. What does it mean?

    Yeah I would check the o-ring on the cover. They tend to flatten with time. Also, any o-rings on/in the filter itself. Plus any hose clamps that you may have may need to be tightened. Also, a low level of water in the skimmer may cause the pump to suck in some small amounts of air which could build up over time.
    20x40 24,000 gal IG plaster/CircuPool RJ45 SWG/2 skimmer/2sp 2.5hp Jandy Stealth/340sq ft cart filter/600sqftHeliocol Solar Panels/6ft semi circlr tanning ledge/25ft deep end bench/5ft sheer descent/2 lion head water features/1300sqft travertine paver/2 Colorlogic lights/Hayward Navigator/3step 2ft raised bond beam

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