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Thread: Calculating how much bleach is required....

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    Calculating how much bleach is required....

    Here are my current numbers...

    TC 6.5
    FC 6
    pH 7.2 (recent acid addition)
    CC .5
    TA 150
    CYA 90

    So let's say that i want to knock the CC down to 0. How do I know how much bleach to add? I must not be smart enough to get the calculator to tell me or i am using it wrong.
    10,000 gallon
    Viking Freeform Fiberglass Inground Pool. FNS Plus DE Filter Pentair Challenger .75hp pump


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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Calculating how much bleach is required....

    That isn't one of the questions the calculator can answer directly, though it will give you a couple of hints along the way.

    Since CC is 0.5 or lower, there is no need to shock. Eliminating low levels of CC can be done by aiming for the high end of the recommended FC range.

    The first thing to do is to look at the Suggested FC Levels for your CYA level. Then use the high end of the normal range as your target FC level and calculate how much bleach you need to add.
    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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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Calculating how much bleach is required....

    Also remember that if you are using a 10 ml sample size, then seeing pink that clears after one drop in the CC test means <= 0.5 ppm and doesn't mean 0.5 ppm. If you were to use a 25 ml sample size, then this would have resolution and accuracy to 0.2 ppm and you may find that the pink still clears after one drop meaning you have <= 0.2 ppm which is certainly nothing to worry about at all.
    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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