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Thread: measuring shock level

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    measuring shock level

    I want to shock my pool because, yesterday, the TC was at zero after a huge storm and two days away from home. I added chlorine (bleach) last evening, and this morning here are my quick numbers:

    FC 3.0
    CC 0
    TC 3.0
    pH 7.4
    TA 70
    CH 300
    CYA 50

    Tha chlorine/CYA chart gives me a shock FC between 16 and 20.
    The Pool Calculator tells me how much bleach to add to reach FC 16 to 20.

    So, I pour that much bleach in, all at once? And then when do I measure FC again? And how do I measure up to 20?

    And, do you think I need to shock?

    Thanks for your help.
    Houston, TX
    16,500 gallon, 31x14 with raised spa, Pentair Quad DE filter, IG, pebblesheen, 2 hp sta-rite max e pro
    rainbow chlorinator, pcc2000 cleaning and circulation system with 1 hp sta-rite pump

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: measuring shock level

    The FAS/DPD Chlorine test is the only test that will measure high levels of FC....up to 50+

    What type test do you have?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: measuring shock level

    I have the TF-100. So, how do I know I've gotten the FC to shock level? Just by the amount of bleach I add?
    Houston, TX
    16,500 gallon, 31x14 with raised spa, Pentair Quad DE filter, IG, pebblesheen, 2 hp sta-rite max e pro
    rainbow chlorinator, pcc2000 cleaning and circulation system with 1 hp sta-rite pump

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    poolgirl22's Avatar
    Join Date
    Apr 2010
    Location
    Stephens City, VA
    Posts
    595

    Re: measuring shock level

    You add the bleach to get to the target amount. If your gallons, etc are correct, what the calc tells you should get you there. But, if you have organics some of that will get consumed right away soooo....
    Add to the target shock.
    Wait 30-60 minutes for it to circulate and retest.
    Enter that number as now, your target number in the target column, and calculate.
    Add that amount.
    Wait another 30-60, retest, add if necessary.

    Repeat.
    Backyard pool-less, but used to be.....
    16,100 gallon, 18x38 3.5 ft deep oval AG, Vinyl, Sand, 1hp pump
    http://www.poolservicestech.com Liquidator
    http://www.poolcalculator.com/
    http://www.tftestkits.net TFT100 test kit

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