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Thread: bleach shelf life

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    jccams's Avatar
    Join Date
    May 2010
    Dexter, MI

    bleach shelf life

    Pool store has a good deal on 12.5% "bleach", 10.99 for 4 gallons. I would like to stock up but do not know how long it will keep before it is say 10%. Apparently they usually only stock 10% but couldn't get it so got 12.5% and are selling it for the same price. They only have a few cases left and I already bought 4 cases. I will be storing it in a cool dark enviroment. What do you think?
    24,000 gal vinyl Lazy L, 1 hp pump, DE Filter, Pentair 250K heater, Letro Legend pressure side pool sweep

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    svenpup's Avatar
    Join Date
    Nov 2009
    Sacramento, CA

    Re: bleach shelf life

    From an old thread...

    Quote Originally Posted by chem geek
    ...The table at the end of this link shows how the half-life (the time it takes to lose half of its concentration) of 20% chlorine even at 75F is 70 days. The fastest loss occurs during the earlier part of that time period. A loss of 10% of the concentration, going from 20% to 18%, happens after just 10 days and that's assuming 75F temperature....
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

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  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: bleach shelf life

    12.5% should be fine for the rest of the season if it is keep reasonably cool. It will lose a little strength by the fall, but not enough to worry about.
    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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