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Thread: Air getting into pump filter basket

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    Join Date
    May 2011
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    Belchertown, Massachusetts
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    Question Air getting into pump filter basket

    Morning, I am getting air in my pump filter basket, not a lot, but enough that it is noticeable. I have two lines, one from Main drain and the other from the skimmer, coming from the pool that meet at a valve housing so I can draw water from either or both at any given time. I only get air in the pump basket when I have the valve set to either skimmer only or main only, and no air at all when it is set to both. Obviously both is the best position to leave it in, but why would this happen? Any ideas?

    Also what is the best way to seal the joints on the plumbing lines, the pool is 15 years old now, and some of the joints may be weakening, can I just go around and seal them with silicone caulk?

    Thank you,
    Tim

    PS I love this site, its helped me solve may pool chemistry issues and saved me money on it as well!
    19,200;IG;Vinyl;DE;Haywood-3600/72 GPM;Hand Vacuum;Full Sun;TF100;bleach

  2. Back To Top    #2
    Richard320's Avatar
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    Re: Air getting into pump filter basket

    Welcome!

    I wonder if the shaft seal on the three-way hasn't taken a set and it dislikes being in any position other than centered?

    Set the valve so it's bubbling in the pump basket and either spray water all over the shaft or coat it with shaving cream. If the bubbles go away or you see foam in the basket, you've found your leak. You can buy overhaul kits for three-ways.

    The only other thing I can thing of is that it isn't air but vacuum because your plumbing is too small or the runbs are too long and you need both feeds to supply enough water to the pump. But that seems really unlikely.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Texas Splash's Avatar
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    Re: Air getting into pump filter basket

    Hello and welcome to TFP! Have you tried everything on this link: Pool School - Suction Side Air Leaks
    Let us know if you need more assistance. Have a nice day.

    As for sealing around joints, could you expand - are you referring to joints on the suction side, pressure side, or both? Could make a difference.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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  4. Back To Top    #4

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    Belchertown, Massachusetts
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    Re: Air getting into pump filter basket

    Thank you, Richard320, I'll give that a try.

    - - - Updated - - -

    I'll read that section on Suction side leaks, must have missed it. I'm talking all joints suction and pressure side, but I only get air in the system from the suction side.
    Texas, Thank you!
    19,200;IG;Vinyl;DE;Haywood-3600/72 GPM;Hand Vacuum;Full Sun;TF100;bleach

  5. Back To Top    #5

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    Re: Air getting into pump filter basket

    Your pump generates a certain amount of suction which is then used to draw water from the skimmers and/or the main drain. When you restrict the ability to suck, by selecting a single source, you are more likely to draw air from a source that is not normally affected. If the air is showing up in your pump basket, the leak will most likely either be the o-ring on your 3-way valve or the cap of the basket chamber itself. As suggested in another reply, try to find the leak with shaving cream, dish soap or get your ear right down there and listen for a sucking noise (alternate is to take a length of 1/2 dia hose and hold that to your ear, using the other end to probe for the noise of the leak. An old mechanics trick). Replacing O-rings is cheap and easy and make sure you coat them with a good silicone grease. Good luck.

  6. Back To Top    #6

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    Re: Air getting into pump filter basket

    Thank you, k9sarretired, I have yet to get the time to test for the leak, but should be able to this week. I suspect that you may be right about the o-ring...
    19,200;IG;Vinyl;DE;Haywood-3600/72 GPM;Hand Vacuum;Full Sun;TF100;bleach

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