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Thread: Is CL loss by percentage?

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    Whatrymes's Avatar
    Join Date
    May 2011
    Location
    E. Bridgewater, MA
    Posts
    132

    Is CL loss by percentage?

    Hey:

    First opening with BBB, initial results (TF-100):
    CL-0
    pH-7.5
    TA-60
    CYA-40
    CH-100

    Water was very clear but there was a "dust" on the bottom so decided to shock. Added 11/2 gals 12.5%, added 4 lbs of baking soda.
    CL-15
    CC-0.5
    pH-7.5
    TA-90
    etc.
    Water is sparkling clear, everything seems well.
    OCLT-1.0, CC-0.5

    I'm just wondering about the speed that the CL fell. Normally, my CL loss never exceeds 4 ppm per day, but I was down from 15 to 6 in 12 hrs.
    Normal?
    Does CL dissipate by % as opposed to the same amount of points no matter what the initial reading is?

    Thank you.
    15 X 30 X 3.6 Ester williams AGP
    10,800 gallons
    Haywood EC40C90 DE filter 1 HP pump
    TF-100 Test Kit

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Is CL loss by percentage?

    If everything else remains the same, the amount of chlorine you lose is a percentage of your starting level. With CYA around 40 your chlorine loss is completely normal.
    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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