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Thread: Quanity of bleach

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    Quanity of bleach

    New here . How much bleach would you use for a 18X33 oval pool to shock it. I used 1 1/2 pound of shock. I have cloudy pool with all readings good.

    thx Mike
    Hydomatic Pressure cartridge Filter
    Prc120 HP 3/4
    18x33 oval above ground pool vinyl 19,600

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    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina
    Welcome to the forum

    Post a full set of water test numbers! Then, help will be on the way!
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    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    Pool numbers

    Here are the no.s from leslies

    Fac 4.0
    ph 7.4
    ta 130
    cal hardness 220
    cya 60
    tds 1000
    Hydomatic Pressure cartridge Filter
    Prc120 HP 3/4
    18x33 oval above ground pool vinyl 19,600

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD
    With CYA of 60, shock level of FC is 18. A an 18x33 that averages 5 feet deep is about 19,600 gallons. To raise FC from 4 to 18 in 19,600 gallons will take 4 1/2 gallons of 6% bleach. If your average depth is not 5 feet you will need to adjust that.

    You can use my pool calculator, see the link in my signature, to figure out things like this.

    Remember that shocking means testing the FC level, adding enough chlorine to bring FC up from there to shock level, waiting a while for the chlorine to work and then repeating the process frequently, up to once per hour, until FC holds steady overnight.
    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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