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Thread: Confused about CYA readings

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    Join Date
    Jun 2010
    Location
    Elkridge, MD
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    104

    Confused about CYA readings

    I have one of the good test kits, and strips also, although both were purchased about a year ago.

    My CYA consistently tested high last year (80-100), but I made do, and every day I swam I tried to dump out at least a hundred buckets of water. I had to refill for a while upon opening.

    My first test of the water (with the good test kit) showed negligible CYA. Because of that, I put in two pounds of pool store shock, which I bought before discovering this site and had avoided because of the CYA issue.

    A few hours later, I checked the water again. CYA of 100 according to the good test kit...then I used a strip, and the strip showed it to be in the good range.

    Does anyone know what might be causing these wildly fluctuating results? The test kits have been stored in a cool, dark place.

    Right now my FC is ~ 5 and my CC is ~ 1.5. How should I continue to shock the pool?

    Thanks in advance!
    32 x 16 20,000 gallon inground vinyl. Pool Genie filter. BBB seems to be working well so far despite high CYA. Aquabot Turbo T which I adore.

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    duraleigh's Avatar
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    Apr 2007
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    Re: Confused about CYA readings

    The CYA test is not particularly precise but it is pretty repeatable.....I think you have some kind of testing error taking place.

    The strips are likely out of date and pretty worthless. Describe how you are performing the CYA test and with what kit.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Elkridge, MD
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    Re: Confused about CYA readings

    OK, now I'm REALLY confused. A couple hours later, I just tested two different samples and got ~50 each time.

    I have the Leslie's K-2006 with all the Taylor chemicals. Fill the little bottle with 7ml of pool water, 7ml of the solution, shake for 30 seconds and pour until the black dot goes away.
    32 x 16 20,000 gallon inground vinyl. Pool Genie filter. BBB seems to be working well so far despite high CYA. Aquabot Turbo T which I adore.

  4. Back To Top    #4

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    duraleigh's Avatar
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    Re: Confused about CYA readings

    Chalk it up to one of those "Twilight Zone" things and go with 50ppm
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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