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Thread: Storing bleach outside; decomposition of bleach

  1. #1
    Join Date
    Jul 2006
    Rochester, NY

    Default Storing bleach outside; decomposition of bleach

    Hi gang.

    Sorry if this has been covered. I couldn't find it anywhere...

    I closed my pool for the winter. I have a few cases of bleach left over, and I would like to store them in my outdoor pool storage box. I live in western NY, where extreme cold winter temps are normal.

    1) Does bleach expand when it freezes? In other words, is there a risk that the containers bursting if they get cold enough?

    2) How quickly does bleach degrade? Should I try to return them to the store, or is it okay to keep them around till next season?

    Hoping to hear from someone who has experience with this, if possible. Thanks a bunch.

  2. #2
    chem geek is offline PF Supporter Whibble Konker chem geek 4 stars chem geek 4 stars chem geek 4 stars chem geek 4 stars
    Join Date
    Nov 2004

    Default Re: Storing bleach outside; decomposition of bleach

    Bleach and chlorinating liquid will last a lot longer at colder temperatures. See the table at the bottom of this page for a table of half-life vs. concentration and temperature. As for freezing, because of the salt and hypochlorite ions the freezing point for 12% chlorinating liquid is around 5F while for 6% bleach it is 19F so if you are expecting colder temperatures you should be concerned about the contents freezing and bursting the bottles. It won't expand until it freezes.
    15.5'x32' rectangle 16K gal IG concrete pool; 12.5% chlorinating liquid by hand; Jandy CL340 cartridge filter; Pentair Intelliflo VF pump; 8hrs; Taylor K-2006 and TFTestkits TF-100; utility water; summer: automatic; winter: automatic; ; PF:7.5

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