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Thread: pool calculator, which % to use

  1. Back To Top    #1

    Join Date
    May 2008
    rock springs, wi

    pool calculator, which % to use

    I am using a liquid chlorine product called "Ultra Shock" pool shock. The label states available chlorine 15%, sodium hypochlorite 12.5%, the rest is inert ingredients. Which % do I use in the pool calculator? Thanks in advance.
    27' AGP with 6' deep end (AquaLeader); 3/4 hp, 2 speed pump (Pentair); 22" sand filter (Pentair Sand Dollar); 2 4x20 Solar Bear panels with Goldline control valve

  2. Back To Top    #2

    Join Date
    Feb 2008
    Denton, TX

    Re: pool calculator, which % to use

    Go with the 12.5%. That's the amount of sodium hypochlorite by weight and that is what you are interested in.

  3. Back To Top    #3

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: pool calculator, which % to use

    The label must be wrong in some way because the 12.5% with 15% doesn't work. The relationship of different percentages is as follows:

    % Available Chlorine by Weight < Weight % Sodium Hypochlorite < % Available Chlorine by Volume (aka Trade %)

    For typical 6% bleach and 12.5% chlorinating liquid, this is as follows because bleach is typically listed by the weight % of sodium hypochlorite while chlorinating liquid is normally spec'd by Trade % which is % Available Chlorine by Volume:

    5.71% Available Chlorine by Weight < 6% Weight Sodium Hypochlorite < 6.17% Available Chlorine by Volume (Trade %)
    10.78% Available Chlorine by Weight < 11.31% Weight Sodium Hypochlorite < 12.5% Available Chlorine by Volume (Trade %)

    It's hard to know what they really mean by their label, but as was suggested you should just use 12.5% in The Pool Calculator and see how things go.

    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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