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Thread: Chlorine Content

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    Join Date
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    Chlorine Content

    I have a new pool and the builder convinced me to get a UV and ozonator installed which disinfects....

    however, I keep testing the water and my CL content is 0, Does the UV burn off the chlorine?

    My water is clear and everything appear to be working well. It is a salt pool so the pH takes some work but the rest seems vertually maintenance free. I figure the CL has to be OK but 0 to 0.5 seems concerning.

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    Mod Squad zea3's Avatar
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    Re: Chlorine Content

    Hi, welcome to TFP! Please post a recent set of test results, it will help us trouble shoot the problem. UV does break down chlorine. Is this an indoor pool?
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    JasonLion's Avatar
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    Re: Chlorine Content

    We don't recommend either UV or ozone on a residential pool. Both of them consume some chlorine, as does sunlight. If you post test results we can give you more specific advice.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Chlorine Content

    28,000 gallon outside residential pool

    Free CL 0
    Total CL 0
    Combined 0
    pH 8
    Hardness 160 ppm
    Alkalinity (w/stabilizer correction) 135ppm
    Cyanuric Acid 50ppm
    Salt 4000


    This pool is 5 weeks old.

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    Mod Squad jblizzle's Avatar
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    Re: Chlorine Content

    Please add your pool details to your signature as described HERE as it will help us help you in the future.

    You also need to invest in one of the Recommended Test Kits and start doing your own testing if you want to take control.

    That is not good that the FC is so low. Our recommended FC levels do not change based on having UV or ozone.

    Your CYA is a little low (if you believe the pool store testing, we do not) for a SWG, but I might hold off on adjusting that.

    How long do you run your pump/SWG? What is the SWG % output?
    Jason, TFP Moderator
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  6. Back To Top    #6
    JasonLion's Avatar
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    Re: Chlorine Content

    I would lower PH to 7.2. Try to keep the PH between 7.2 and 7.8. With a SWG and high TA the PH will tend to go up all the time. Each time PH gets to 7.8 you can lower it to 7.2. Long term that will lower TA, and reduce the amount of PH drift you experience.

    You need to maintain the FC level one way or another. If the SWG doesn't take care of it, you need to add chlorine manually.

    FC going down to zero usually indicates a need to SLAM the pool, see the instructions in the How To section of Pool School.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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