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Thread: Am I losing chlorine from bubbles reaching surface?

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    Join Date
    Apr 2013
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    Am I losing chlorine from bubbles reaching surface?

    I recently replaced my single speed motor with a 2-speed and wired the SWG to produce only on low speed. Previously with the single speed motor, I would see very small bubbles coming out of the returns when the SWG was producing, and always wondered if I am losing chlorine from any bubbles that make it to the surface (and thus also losing salt because the chlorine that escapes does not recombine into salt). Now, with the SWG only producing at the pump low speed, I see much larger bubbles at the returns just sort of dribbling out of the return fitting, and a larger majority of these bubbles reaching the surface. Is this normal on a low pump speed? If so, aren't I losing chlorine and salt this way? (I did check to be sure the bubbles weren't air being drawn in from a suction line leak--the bubbles only appear when the SWG is producing.)

    I've never used an eyeball return fitting (I already have long pipe runs and wanted to minimize pressure loss), but wonder if this would be a good idea to help dissolve the chlorine gas given the higher flow velocity at the return.

    Any thoughts?

    Jim
    33,000 gallon, IG vinyl, Hayward Super Pump, 1.5 Hp single speed, sand filter, salt system, built 2002

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    Re: Am I losing chlorine from bubbles reaching surface?

    The SWG also produces hydrogen gas. It's likely that this is what you're seeing. With long pipe runs, chlorine gas usually has sufficient time to fully dissolve.

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    Re: Am I losing chlorine from bubbles reaching surface?

    OK, that would explain why I could not detect any chlorine odor at the surface as I expected thinking it was chlorine gas. But then is it normal to see hydrogen bubbles? I didn't find any mention of bubbles from a SWG. If this is hydrogen, I can make a mini-Hindenberg by collecting these bubbles for just a few days...it really seems like a lot of bubbles.
    33,000 gallon, IG vinyl, Hayward Super Pump, 1.5 Hp single speed, sand filter, salt system, built 2002

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    linen's Avatar
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    Re: Am I losing chlorine from bubbles reaching surface?

    Swgs do make bubbles, but if you are having a lot of bubbles, you may have a suction side leak. Do you have air showing in your pump basket cover?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Am I losing chlorine from bubbles reaching surface?

    thanks for asking the question, i was about to look it up and found the answer.
    new to pool and generator I believe was not used in years.
    mine only bubbles when the generator is on.
    thanks linen, jim and james...


    funny after re-reading the post too bad you could not collect the hydrogen and run a
    fuel cell generator....in your next car.
    18X36 Grecian 24400 est., pacfab sand Triton II, 1.5hp AOSmith, clormatic 2

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    Re: Am I losing chlorine from bubbles reaching surface?

    Linen, no, the bubbles only are present when the SWG is actively operating, so I don't think I have a suction side leak.

    eaamon...about collecting the hydrogen, I actually did think about how to capture some to inflate a plastic bag to make a mini-Hindenberg!
    33,000 gallon, IG vinyl, Hayward Super Pump, 1.5 Hp single speed, sand filter, salt system, built 2002

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