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Thread: Where to read CYA, in sunshine or shade?

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    Guest

    Where to read CYA, in sunshine or shade?

    My pool used to have CYA 100-120.
    I replaced 2/3 of my pool with tap water.
    I just test the CYA, but not sure about the results.
    If I look at the black dot under the direct sunshine (noon), it's about 40 when the dot disappears.
    However, if I look at it in shade or indoor, the black dot disappears at about 50.
    So, my CYA is 40 or 50?
    This test is really tricky to me, because the "disappear of black dot" is somewhat subjective.
    How do you guys determine the "disappear"? The black dot is COMPLETELY gone? or very unclear (something black, but not a whole dot)?
    Thank you in advance!

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    frustratedpoolmom's Avatar
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    Re: Where to read CYA, in sunshine or shade?

    outside, direct sunlight if possible, with your back to the sun so your body shields the view tube. It is subjective, I know.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Butterfly's Avatar
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    Re: Where to read CYA, in sunshine or shade?

    See if this helps:

    Extended Test Kit Instructions for CYA test: extended-test-kit-directions-t25081.html

    and make sure you 'see' the visual test, this has helped many of us! ...scroll down for pics..
    http://www.taylortechnologies.com/Chemi ... ntentID=44
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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    Guest

    Re: Where to read CYA, in sunshine or shade?

    Thank you so much for the links!

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    frustratedpoolmom's Avatar
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    Re: Where to read CYA, in sunshine or shade?

    Thanks Joyce my links are all on my old (dead) computer. LOL too lazy to search for my shortcuts!
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  6. Back To Top    #6
    Butterfly's Avatar
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    Re: Where to read CYA, in sunshine or shade?

    Both of you are welcome
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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