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Thread: Whats causes Chlorine to decay - Light, or Heat?

  1. Back To Top    #1

    Join Date
    May 2009
    Seminole, FL

    Whats causes Chlorine to decay - Light, or Heat?

    Or Both?

    Just curious. If Chlorine is kept away from sunlight, but in a hot environment (ie, a Shed @ 95-100 degrees) will it keep it from degrading? Or does both heat and sunlight cause Chlorine to breakdown?
    ~13000 inground plaster
    150sq Ft Cartridge Filter

  2. Back To Top    #2

    Join Date
    Jan 2009
    Cupertino, CA

    Re: Whats causes Chlorine to decay - Light, or Heat?

    Chlorine in the pool will break down from UV light.

    Bleach will also degrade from heat. According to information here, 10% bleach at 90F will degrade to 5% in about 4 months. You'd expect it to follow some sort of concentration-dependent decay curve, i.e. it would drop faster at first and slower later.

    Other forms of chlorine (dichlor, trichlor, cal-hypo) have much longer shelf-lives, but of course they also contain other things you might not want to add to your pool.
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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