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Thread: Return air bubbles

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    Join Date
    Jun 2010
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    Northern Vermont
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    Return air bubbles

    Hi everyone,

    I have a 25,000 gal IG vinyl pool. I began the opening process late last week, and all seems to be going fine except that yesterday we noticed consistent light bubbles coming from the two returns. We have a Hayward 1/2 HP motor on a Rainbow M series 8 cartridge filtration system. Everything in the pool shed looks dry -- no leaks that I can see.

    In addition to the two returns we also have a Polaris hook up with a booster pump. Water regularly flows (lightly) through the Polaris return, and we sometimes get bubbles there too. Last year we did find that there was a leak on the Polaris return line. Our local pool guy cut it out and spliced it.

    So, any thoughts on where the air is coming in and what I can do to trouble shoot the issue?

    Thanks!
    25,000 Gallon, IG, vinyl, Pentair Whisperflo WFDS-24 (2-speed), 8 Rainbow M Series cartridge filters, unheated

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
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    9,089

    Re: Return air bubbles

    You probably have a leak before the pump. Check your pump strainer lid and drain plug for good, well lubricated O-rings, and make sure they are tight. Next, check any unions or union-type valves on the suction lines for tightness.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Join Date
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    Location
    Northern Vermont
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    Re: Return air bubbles

    Quote Originally Posted by JohnT
    Check your pump strainer lid and drain plug for good, well lubricated O-rings, and make sure they are tight.
    I can lube the O rings with silicone, and check the pump strainer lid. As for the drain plug ... I'm not sure what that is. I know on the front of the cartridge system there is a pipe that looks like it is sealed with a putty & plug of some sort. There is also a faucet on the opposite end of that pipe that I've never touched. Is this where the plug is?
    25,000 Gallon, IG, vinyl, Pentair Whisperflo WFDS-24 (2-speed), 8 Rainbow M Series cartridge filters, unheated

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    Mod Squad JohnT's Avatar
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    Apr 2007
    Location
    SW Indiana
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    Re: Return air bubbles

    Quote Originally Posted by Backyardchemist
    Quote Originally Posted by JohnT
    Check your pump strainer lid and drain plug for good, well lubricated O-rings, and make sure they are tight.
    I can lube the O rings with silicone, and check the pump strainer lid. As for the drain plug ... I'm not sure what that is. I know on the front of the cartridge system there is a pipe that looks like it is sealed with a putty & plug of some sort. There is also a faucet on the opposite end of that pipe that I've never touched. Is this where the plug is?
    On the bottom of your pump strainer basket, there is a small threaded plug to drain the basket for winterization.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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