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Thread: "Concentrated" bleach -- what does that mean?

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    OutWest's Avatar
    Join Date
    Jul 2016
    El Dorado County, CA

    "Concentrated" bleach -- what does that mean?

    I was at Home Depot yesterday and decided to check out their bleach. Much to my surprise they had different ones--for outdoor and indoor, a concentrate that said it had to be diluted, ya da ya da ya da. Nowhere on the label could I find the percentage of actual bleach (12.5% etc.) that has been discussed here in the pool school articles on chemistry.

    Has anyone used this stuff? Is the concentrate too strong for pool use? I could see no additives listed on the labels.
    8,900 gal in-ground gunite lap pool; self-cleaning Jandy 1.5 HP Pro Series E-pump system; Jandy CV340 pool/spa filter with four cartridges; Propane heater (rarely used); motorized pool cover.

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    needsajet's Avatar
    Join Date
    Jan 2016
    Sydney, NSW, Australia

    Re: "Concentrated" bleach -- what does that mean?

    It won't be too strong for pool use, but I would not buy anything that doesn't have the % and manufacture date on it.

    The most expensive bleach I've seen was in a spray bottle as "stone and brickwork cleaner" 3% sodium hypochorlite, 20 oz spray bottle for $7.99 (around $50 per gallon for 3% bleach)

    2nd highest I've seen was "driveway cleaner" with 3% bleach and $20 a gallon.

    You want 8.25% minimum and around $2.50 / $3.00 per gallon. Sometimes the same stores have pool shock (liquid) at 10% sodium hypochlorite and around the same price. Get the freshest you can find - manufacture date 16150 means 2016 and 150th day of the year. The highest I've seen is 12.5% and I've read that it's a practical manufacturing limitation that limits from being very much higher.
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    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: "Concentrated" bleach -- what does that mean?

    +1 to not buying anything without the percentage clearly marked. It varies some by state but here is how it usually works. These are all the same product, just different strength.

    6% regular bleach
    8.25% concentrated bleach
    10% liquid chlorine
    12.5% liquid shock
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