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Thread: Low CYA ...

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    Join Date
    Jul 2013
    Location
    Chicago IL
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    83

    Low CYA ...

    Just tested after 2 days ::

    FC 6.0
    CC 0.0
    PH 7.3
    TA 130
    CYA 10

    What are the effects of such low cya?
    Reason i stay away from stabilizer is i get like a chlorine type rash everytime i add it , no matter how small of increments.
    15ft Round, Above Ground , Rheem 106K Heater , Black Diamond 90 Cartridge Filter, Pool Frog(disconnected) ,TF-100, City of Chicagos finest H20

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    Join Date
    Jun 2012
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    Louisville, KY
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    Re: Low CYA ...

    The effect will be you will lose more FC to sunlight. How much are you losing per day? That would lead to higher costs for more bleach/chlorine.

    Are you sure the rash is from the added CYA? It's possible your FC isn't high enough for the CYA level you bring it to leading to CC, that can cause a rash? Are you able to always maintain a FC of 2-3 constantly with the low CYA without it dropping below 2 at any time?

    FC/CYA chart
    pool-school/chlorine_cya_chart_shock
    18x36 inground vinyl lined, Hayward sand filter and tablet chrolinator, approx 18k gallon

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    Re: Low CYA ...

    This has been going on for a few years with me .Swam with high/low FC , no prob. High/low Ph no prob. If i add a handfull of chlorine stablizer , itchy dry rash on back and legs that last a week.... Last time it happened i drained 1/2 the pool , just kept up with FC/PH . Added 0 stabilizer, havent had a problem since
    15ft Round, Above Ground , Rheem 106K Heater , Black Diamond 90 Cartridge Filter, Pool Frog(disconnected) ,TF-100, City of Chicagos finest H20

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    Jun 2012
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    Re: Low CYA ...

    Well if you're able to maintain adequate FC at ALL times then that's really the only down side - cost of more bleach daily.
    18x36 inground vinyl lined, Hayward sand filter and tablet chrolinator, approx 18k gallon

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    Re: Low CYA ...

    I assume that 10 ppm is a guestimate since the TF-100 only goes down to 20 ppm so you see the water in the tube being a tad cloudy but can still see the black dot, correct?

    I can't find anyone reporting anywhere about sensitivity to CYA and nothing in the scientific literature on it that I could find. So that's really unfortunate that it causes you problems. I wonder if perhaps it's only with some brands of CYA such as some imports that some people found don't raise the CYA as much as they should which implies they have some sort of filler and perhaps that is what is irritating.
    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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    Re: Low CYA ...

    Quote Originally Posted by chem geek
    I assume that 10 ppm is a guestimate since the TF-100 only goes down to 20 ppm so you see the water in the tube being a tad cloudy but can still see the black dot, correct?

    I can't find anyone reporting anywhere about sensitivity to CYA and nothing in the scientific literature on it that I could find. So that's really unfortunate that it causes you problems. I wonder if perhaps it's only with some brands of CYA such as some imports that some people found don't raise the CYA as much as they should which implies they have some sort of filler and perhaps that is what is irritating.
    Yep the water was just a little cloudy at the top ,between 0-20, did it twice same result ... Thats what i was thinking at first , this rash thing happens with two things , Chlorine Pucks/Tabs and Chlorine stabilizer..... When i switched my chlorine to Liquid Chlor for FC , and Borax for PH , the problem totally went away. I narrowed it down to stabilizer/chlor tabs. There must be just some chem in there that dont agree with me.
    15ft Round, Above Ground , Rheem 106K Heater , Black Diamond 90 Cartridge Filter, Pool Frog(disconnected) ,TF-100, City of Chicagos finest H20

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