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Thread: Air Bubbles in Return Line

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    Question Air Bubbles in Return Line

    I am having a lot of air bubbles in my return lines to the pool. I have a AutoPilot Salt Chlorine Generator (RC 35/22) it is see through and i can see a lot of air in the cell. There are no air bubbles in the pump (when you look through the plastic cover over the basket). I recently had all the lines pressure tested by a pool company and they found no leaks.

    There is a three way valve imedialtely after (in line with ) the salt chlorine generator cell before the water goes into the pool. This three way valve controls which returns get the water. There are 4 returns so you can have two on at a time or leave the valve in the middle and then all 4 returns shoot water out.

    The interesting part is the when I turn the valve all the way over to only use the 2 returns in the steps of the pool no air comes out, when i turn the valve to 50/50 or on the two other returns outside the pool steps the i got a lot of air.

    How is this possible? It is not on the suction side so how can air come into the system. If there is a leak wound water shoot out somewhere?

    Please Help


    30'000 Gallon Salt Water
    AutoPilot Digtital Nano Salt Water Chlorine Generator
    AquaCal Heat Pump
    CoPilot Ozonator
    Jandy 1.5 HP Model#PHPM1.5
    Candy Pool Filter Model#DEV48

  2. Back To Top    #2

    Join Date
    May 2014
    Laughlin, NV

    Re: Air Bubbles in Return Line

    Salt Water Chlorine Generator's generate bubbles when on. See if the bubbles stop when your Generator is not on (but the pump is on). If no bubbles -- no worries.
    6000 Gallon IG Fiberglass with integrated Spa
    Pentair CCP240 Cartridge Filter with Pentair Intelliflow 3050VS Pump and Pentair HTR250 heater. IC40 SWG. EasyTouch 4. TF 100 Test Kit.

  3. Back To Top    #3

    TFP Guide
    Jimrahbe's Avatar
    Join Date
    Jul 2014
    Bedford, TX

    Re: Air Bubbles in Return Line


    I suspect that when you have all four returns open the flow is less and that allows you to see the bubbles easier. When you have the return water only going to two of your returns the pressure goes up and makes it harder to see the bubbles.

    As mknauss says, if the bubbles are only there when the SWG is producing chlorine, then you have nothing to worry about. I'm not familiar with your specific SWG, but most of them turn on and off every few minutes based upon the percentage of output you it set for.

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP5200 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2.

  4. Back To Top    #4
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: Air Bubbles in Return Line

    Agreed. My SWG makes plenty of bubbles. Turn it off and see what happens. The other two returns might be capturing the bubbles somewhere and will give a big bubble sooner or later.
    TFP Moderator
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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

  5. Back To Top    #5

    Join Date
    Aug 2016
    San Antonio

    Re: Air Bubbles in Return Line

    I am absolutely brand new to pools and most of this is Greek to me. However just after we bought the house our pool started to blow bubbles out the jets. Not sure if that's what you are talking about or not. I found out my water level was to low and the skimmers were sucking air. Once I got the water level back up where it was suppose to be it quit. Again brand new but thought this might help.
    New pool owner. Bought a home with a 18,000 gal in ground salt water concrete?? Pentair intellichlor and cartridge filter. I Know absolutely nothing about pools!

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