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Thread: Air Bubbles out of return jets

  1. Back To Top    #1

    Join Date
    Sep 2016
    Boynton Beach/Florida

    Air Bubbles out of return jets

    Hello all,

    I have a pool that was probably installed back in the mid 80's. I've owned the house since '97. I have always noticed a few bubbles coming from one of the jets but not too bad.
    the pool has a spa so it has to return lines one for spa & one for pool with a 3-way valve. Back in march my main drain started leaking (pump wouldn't prime unless I valved it off) and I was loosing 2" of water a day. I had a pool company remodel the pool because I had been patching everything along for a long while & having trouble finding outdated parts.
    here is what was done.
    1. stripped pool & replaced all tile & diamond bright.
    2 installed new main twin drain with new home run back to pump (nothing reused).
    3. Installed Vacuum Port (didn't have it before) and ran back to pump.
    4. new filter system, salt system, new valves & re-plumb everything at the pump but reused my existing pump (re-built recently).
    now I have a lot of bubbles out of all of the jets.
    the pool company tried everything listed below to get the bubbles to stop.
    1. pressure checked all suction lines (they said all OK)
    2. replaced my pump with new pump.
    3. replaced a couple of valves.
    after all of the above still have a lot of bubbles all jets pool & spa.
    last week they were out and pressure tested both return lines.
    they said they wouldn't keep pressure and both must be slightly broken & that's where the air is coming from.

    what's bothering me is my pool gets a lot of sun (south florida) & I run it 8hrs a day 7 days a week and have not needed to add a drop of water since the initial filling of the pool back in april.
    I know this is a long lead up to the question so here it is.

    does it seem possible that both return lines could have broken under ground and put out almost the same amount of bubbles in the pool & spa without losing any water ?

  2. Back To Top    #2
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: Air Bubbles out of return jets

    Welcome to TFP!

    A few air bubbles 1 or 2 returns is usually the SWG and will stop when it is off. Lots of bubbles in all returns is usually a suction leak. It sucks air into the plumbing before the pump and they often don't leak water. More here, 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

  3. Back To Top    #3

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    bmoreswim's Avatar
    Join Date
    Jul 2012
    Central MD

    Re: Air Bubbles out of return jets

    Bubbles from my SWCG come out of 2 of my 4 returns and sort of a 3rd. A good volume of bubbles actually. I have a short run from the equipment.
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. Saltwater w/ gray plaster
    Hayward equipment (cartridge filter, 2-speed pump, salt cell, automation) View Our Build
    Coverstar automatic pool cover | StoneMakers concrete retaining wall and decking
    Groundbreaking: 2/14/13 | Plaster: 5/21/2013 | First Swim: 5/30/2013

  4. Back To Top    #4

    Join Date
    May 2016
    Cincinnati, OH

    Re: Air Bubbles out of return jets

    If the bubbles dont stop when the SWG is off, AND IF you do not see bubbles in the pump strainer basket lid (suction leak), then it might be related to the spider gasket in a multiport valve (if you have one). With the pump off, try moving the valve handle slightly (lift it, move, reseat) to see if you can get rid of the bubbles.
    30000 gal inground vinyl liner;sand filter w/glass media, nuvo uv, TF-100 test kit; 25 years on Baquacil, switching to TFP chlorine in 2016

  5. Back To Top    #5

    Join Date
    Jun 2011
    Carlsbad, NM

    Re: Air Bubbles out of return jets

    To answer your question, no- if returns had leaks they would push water out, not draw air in.
    36' x 18' 20k in ground, Finest Finish grey plaster, Pentair Tagelus 100D sand filter, Hayward Northstar 2hp pump, Jandy LRZ125EN heater, spill over spa, iaqualink controlled automation, Stenner chlorination, natural rock and flagstone coping, 1" glass mosaic waterline tile, SR Smith Vortex slide.

  6. Back To Top    #6
    platipus's Avatar
    Join Date
    Feb 2015
    Houston, TX

    Re: Air Bubbles out of return jets

    Shot in the dark here... Are your pump leaf basket O-rings lubricated and in good shape and baskets clean? On our koi pond , if I forget to check that semi-regularly it has in the past created a vacuum leak there that sucks air into the system. Clean and lube and it goes away.

    Modern Geometric-ish Social Pool (4'-5'-4') ~13' x 47'. Sun shelf. Perimeter overflow spa. RiverFlow Swimjet. Dog ramp. "Bubble Lounge"
    Link to my patio build, completed 2013
    Link to my pool build, Aug '15 - Sep '16

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