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Thread: Very low chlorine usage

  1. Back To Top    #1

    Join Date
    Aug 2008
    Location
    Rochester, NY
    Posts
    48

    Very low chlorine usage

    Hi,
    I'm one week into BBB and my chlorine usage has been very light. My FC has only been dropping .5 ppm per day. Is this normal? The water is still 64 degrees and it hasn't been used as of yet. My CYA is around 65-70 so i am trying to keep my FC at approx 7-8 ppm. I added 1 qt of 12% on Friday which brought it up to 9 ppm FC and have needed no additions since then. On a side note, there are 2 pool companies near here that recommend FC of 1-3ppm. Why does that seem to be the consensus of pool companies? Just curious.
    20000 gal IG freeform, vinyl, Pentair Sand Dollar filter, Pentair 2 speed pump, Pentair Intellitouch controller, Pentair Heat Pump. Built 2008

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Very low chlorine usage

    Low chlorine usage is common when the water is cold, especially at your slightly high CYA level. Chlorine usage will increase as the water warms up.

    Keeping FC between 1 and 3 is an old rule from before CYA was used. Adding CYA to the water dramatically changes where your FC level should be.
    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

  3. Back To Top    #3
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, AZ
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    3,897

    Re: Very low chlorine usage

    .5 ppm/day with cold water, 70 ppm CYA, and no swimmers sounds about right.

    Jason's fast....
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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  4. Back To Top    #4

    Join Date
    Feb 2008
    Location
    Flower Mound, TX
    Posts
    5,062

    Re: Very low chlorine usage

    Quote Originally Posted by Melt In The Sun
    Jason's fast....
    Like a puma!
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
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    "It depends."- JohnT

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