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Thread: Yet Another Suction Side Leak Thread

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    Join Date
    Sep 2015
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    Avondale, AZ
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    Yet Another Suction Side Leak Thread

    Good morning everyone. I have a suction side leak. They suck! lol. I've had the pool since November. From the beginning I had an air leak from the main drain line, as the popups would spit a pretty sizable amount of air when pulling from the drain. When pulling from the skimmer, they didn't spit air, but the skimmer basket still always a 3-4" head of air. Recently, it's been sucking air from either side, as over the last few days, I lose prime overnight when the pool is running on auto. It's on low speed at that hour, but I've never had this issue before. When I wake up in the morning to check it out, I'm barely getting any water from the spa spillover, where in the past, it was spilling over well. When I open the bleed on top of the filter, it's loaded with air! Regardless of pulling from the pool or spa, there is always the 3-4" of air in the skimmer basket.

    I greased the pump union and tightened it well. I cleaned and greased the basket cover, and checked it several times for any cracks. I teflon-taped the pump drain plugs. I don't know what else to do. I'm guessing it HAS to be above ground, as it's doing it from skimmer or suction (and I still have the large air pocket in the skimmer basket when pulling from the spa as well, although it doesn't seem that air builds in the filter). I tried to isolate the leak last night with a fog machine (I'm a big kid during Halloween), but I didn't see anywhere that seemed to be pulling fog. Granted, it was tough to tell, because the pump fan was disruptive things a bit. I also tried dousing things with water but that didn't seem to make any difference either. Do the valves ever go south and start leaking? After ruling out the union/basket cover, etc., I'm thinking maybe the valve that diverts from skimmer/main drain? That is a common denominator here. That wouldn't explain the air in the skimmer basket when pulling from the spa, however.

    Is there anything I didn't try that would be helpful? I can't keep letting the pump lose prime because of such a massive leak. THANK YOU in advance!!
    Approx 25k gallon PebbleTec in-ground diving pool and attached raised (10 person?) spa, with spillover and waterfall.
    Hayward AquaLogic PS-4 control board, Hayward SP3400VSP Ecostar pump, Hayward C5520CP cartridge filter, Hayward H400FDN 400k BTU NG heater

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    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    Re: Yet Another Suction Side Leak Thread

    You could very well have an air leak around the O-ring on the three-way valve. Coat any suspicious areas with shaving cream. If you start to see foam in the pump strainer or coming out the returns, you know it's getting drawn in. You might even get lucky and see a cavity form where the leak is.
    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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    Mod Squad pooldv's Avatar
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    Re: Yet Another Suction Side Leak Thread

    LOL! Yes, suction side air leaks do suck! Have you checked to make sure all the screws on the valves are tight?

    Here are some more tips, Pool School - Suction Side Air Leaks
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Yet Another Suction Side Leak Thread

    Thanks! I'll look at it a little more after work today. I did not check valve screws yet.

    Approx 25k gallon PebbleTec in-ground diving pool and attached raised (10 person?) spa, with spillover and waterfall.
    Hayward AquaLogic PS-4 control board, Hayward SP3400VSP Ecostar pump, Hayward C5520CP cartridge filter, Hayward H400FDN 400k BTU NG heater

  5. Back To Top    #5

    Join Date
    Sep 2015
    Location
    Avondale, AZ
    Posts
    87

    Re: Yet Another Suction Side Leak Thread

    I didn't get a chance to look yesterday due to a sick dog. At this point it might not be till the weekend. I'll let you all know what I find. Thanks again!
    Approx 25k gallon PebbleTec in-ground diving pool and attached raised (10 person?) spa, with spillover and waterfall.
    Hayward AquaLogic PS-4 control board, Hayward SP3400VSP Ecostar pump, Hayward C5520CP cartridge filter, Hayward H400FDN 400k BTU NG heater

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