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Thread: Available chlorine vs sodium hypochlorite

  1. Back To Top    #1

    Join Date
    Jun 2010
    Rural Southern Illinois

    Available chlorine vs sodium hypochlorite

    So my normal supplier of pool shock switched brands and instead of 10% sodium hypochlorite on the old brand, the new brand says 15% available chlorine and 12.5% sodium hypochlorite. My guess is I need to calculate using sodium hypochlorite, but I wanted to ask to be double sure.

    On the bright side, the price I still the same, 4 gallons for $9.99!

    Thanks as always for your help!
    17100 gallon 27' Round 4' Deep Above Ground Pool
    Hayward Cartridge Filter 1 HP pump 50 GPM flow rate

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Available chlorine vs sodium hypochlorite

    Pool Calculator will let you plug in 12.5%. It also has that as one of the choices on the drop down menu.
    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!

  3. Back To Top    #3

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Available chlorine vs sodium hypochlorite

    As Richard says, put in 12.5% into The Pool Calculator, but their 15% Available Chlorine can't be right. The following relationship is usually true:

    % Available Chlorine (weight % of chlorine) < weight % of sodium hypochlorite < Trade % of chlorine (volume % of chlorine)
    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"

  4. Back To Top    #4
    DCAG's Avatar
    Join Date
    Jul 2009
    Merrimack, NH

    Re: Available chlorine vs sodium hypochlorite

    And $10 for four gallons of 12.5% is excellent

    good for you!

    16' X 24' Wilkes Pools "Genesis", 10K Gal
    Hayward Powerflo Matrix 1 hp, & 18" Pro Series sand (S180T)

  5. Back To Top    #5

    Re: Available chlorine vs sodium hypochlorite

    Menards has that same price right now, too bad it isn't the regular price! I pay $13 for 4gal of 10% which was only $11 last year.
    [ Vogue Vectra 24' AG | Hard plumb: Hayward Power-Flo Matrix 1HP 2-speed, 27" sand filter & Pentair MiniMax 100 NG | Taylor K-2006 | Central IL ]
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