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Thread: I don't understand "shocking"

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    I don't understand "shocking"

    My pool balance is pretty good right?

    FC- 5
    PH - 7.6
    TA - 100
    CH - 450
    CYA - 70

    If I keep the numbers at, or close to this level, do I ever need to shock?
    If so why?
    Won't that drive the FC way high and throw the whole pool out of balance?
    Sorry for being such a newb, but my pool suffered some serious low calcium issues last year and so I am determined to stay on top of things.
    6600 gal IG concrete/gemcoat
    Fresh water
    1 HP motor
    StayRite PLM 100 system 2 filter
    full sun
    Treasure coast, Florida

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    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: I don't understand "shocking"

    Quote Originally Posted by avidone1
    My pool balance is pretty good right?

    FC- 5
    PH - 7.6
    TA - 100
    CH - 450
    CYA - 70

    If I keep the numbers at, or close to this level, do I ever need to shock?
    If so why?
    Won't that drive the FC way high and throw the whole pool out of balance?
    Sorry for being such a newb, but my pool suffered some serious low calcium issues last year and so I am determined to stay on top of things.
    You might.....

    With CYA of 70, you never ever want to let FC dip below 5. You're at 5 now. A bunch of dirty kids, a windstorm blowing a bunch of crud in, a really hot day, you run out of bleach, or forget to add one day, any of the above and you're too low on FC. Then the algae and the FC are at a stalemate, unless the same happens again, in which case the algae takes over.

    Bump the chlorine to 8 or 9 to buy some room for error.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: I don't understand "shocking"

    If nothing goes wrong, there is no need to shock. You shock to solve a problem, like a pool full of algae or a high CC level.

    High FC levels correct themselves fairly quickly in an outdoor pool.
    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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