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Thread: Brain Pick - Need some feedback on chlorine usage, CYA level and testing

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    Join Date
    May 2016
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    Chesapeake, Virginia
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    Question Brain Pick - Need some feedback on chlorine usage, CYA level and testing

    FC target 6
    FC before daily chlorine addition 3
    CC 0-0.5
    PH 7.4
    TA 120
    CH 80
    Current CYA 30.
    New CYA target 40. Will be testing and adding CYA soon.

    Last week, my FC was getting really low everyday (1-1.5) and I was using 25 -30 oz. per day. So I did a CYA test and of course it was under 30. (Hate that the K2006 CYA test doesn't go below 30. ) Didn't help that we were having high 90 deg days with periods of heavy rain. Needless to say I was burning through some chlorine and the walls and bottom kept getting a little slimey. I brushed. I SLAMMED. It's back to clear and trouble-free.

    Currently using 16oz. of 12% daily. For a 5300 gallon pool in the middle of summer, is that normal?

    Can heavy rain lower CYA by 10-15ppm?
    Is trying to maintain CYA of 30 realistic?
    Is there another good test option for CYA that doesn't require a lot of reagent?
    15' Above Ground, 4' water depth - approx. 5300 gallons.
    Hayward 1HP Pump-60gpm and 100# Sand Filter. Taylor K-2006 Test Kit.
    Loving our little trouble-free pool.

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    Piolin's Avatar
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    Sep 2010
    Location
    Miami, FL
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    604

    Re: Brain Pick - Need some feedback on chlorine usage, CYA level and testing

    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
    Pool School - Chlorine / CYA Chart

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    Mod Squad pooldv's Avatar
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    Aug 2012
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    DFW, TX
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    23,998

    Re: Brain Pick - Need some feedback on chlorine usage, CYA level and testing

    How many ppm of FC is that per day? 2-4ppm per day is normal.

    You probably want your CYA at 40 to better protect FC from the sun.

    CYA burns off at 2-3 per month on its own, up to 5 ppm in 90+ degree water. Bacteria can also consume cya when FC drops below low minimum for your CYA, FC/CYA Chart. Higher FC at SLAM level can also use up some add iona CYA. So, you've got quite a few things going on that can potentially consume a fair amount of CYA.

    You can buy the cya tube from TFTestkits.net
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