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Thread: Chlorine degradation due to heat over time

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    benavidescj's Avatar
    Join Date
    Apr 2010
    Fleming Island, FL

    Chlorine degradation due to heat over time

    You guys have probably seen this. Nice chart showing 12% chlorine degradation over time due to heat.

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Chlorine degradation due to heat over time

    Thanks. That's a nice chart and seems roughly consistent with the table at the end of this link. The half-life (50% loss of concentration) of 12% bleach at 90ºF would be around 80 days or 11.4 weeks which is a little better than the projected 9 weeks in the chart, but the Odyssey product is supposed to be of high-quality mostly free of metal ions so that it lasts longer.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Tucson, AZ

    Re: Chlorine degradation due to heat over time

    When bleach decomposes, what does it become? Salt and oxygen?
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Chlorine degradation due to heat over time

    Yes. See this post for details on the chemistry.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Join Date
    Aug 2012
    Melbourne, Australia

    Re: Chlorine degradation due to heat over time

    Is there any way to test chlorine concentration at home?

    Other than using the pool calculator and discovering you have a weak batch of liquid chlorine/bleach!
    13,000 gallon; sand filter; inground; fibreglass; pump not sure yet (need to check); Installed over 12 months ago.

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