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Thread: Bleach Storage

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    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Bleach Storage

    So I opened my pool today. Had 2, 182 oz jugs of Walmart brand bleach left over from September, stored in my garage. Dumped them in anyway for the heck of it thinking they would be very weak. Huh. Nope - FC was 14 when I tested a few hours later, so they still had some juice left. I was surprised.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Bleach Storage

    Congrats! Looks like it seems to hold up fairly well in storage at least over the "cooler" months. Just caught some on sale and bought enough to cover through June here. July and August purchases will be one month purchases at a time though.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    Join Date
    Jan 2009
    Cupertino, CA

    Re: Bleach Storage

    According to this link 5% bleach at 75F has a half-life of over 3 years. At a constant 90F it still has a half-life of one year.

    Yes, bleach degrades; but unless you get the double-strength liquid chlorine and keep it a while in the summer, it's not a practical concern; and even then it's noticeable but not huge. My 12.5% degraded to 9.5% after 6 weeks, last summer; it was probably running 90+F daytime high temp.
    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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    Isaac-1's Avatar
    Join Date
    May 2010
    SW Louisiana

    Re: Bleach Storage

    I think the big worry most people should have on this topic now is buying 10% liquid chlorine that has been sitting around for 6 months are longer over the slow winter season.

    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from
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  5. Back To Top    #5

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Bleach Storage

    My local pool store intelligently cuts back their chlorinating liquid purchases such that their inventory is drastically lower during the winter season so that the slow turnover matches demand. They store the chlorine outside in a shaded area so it stays much cooler in the winter (we rarely get freezes cold enough or long enough to affect the chlorine). So people still buy chlorine over the winter, but instead of my buying a case with 4 gallons for one month, I buy 1 gallon that lasts 2-3 months during the off-season.
    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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