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Thread: Knocking Sound Coming from Return

  1. Back To Top    #1

    Join Date
    Mar 2011
    Location
    Houston, Texas
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    413

    Knocking Sound Coming from Return

    I'm hearing a faint knocking sound coming from one of my returns. The same return also has a few bubbles coming out of it. They don't come from the opening of the return, but they come from the small space between the plaster and the return fitting. Could this be from my SWCG? The flow from the return is no different than the other four returns of the pool so nothing appears to be obstructing the flow from that return. I've noticed this for months. Any ideas?
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    SouthWest Alabama
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    22,347

    Re: Knocking Sound Coming from Return

    That's a good one. I suppose it's possible it's possible for the hydrogen bubbles to build up behind the faceplate and bubble out. What happens if you remove the fitting? Does it still bubble?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

    Join Date
    Mar 2011
    Location
    Houston, Texas
    Posts
    413

    Re: Knocking Sound Coming from Return

    I thought it might be hydrogen bubbles as well. I haven't tried removing the fitting yet.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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