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Thread: cya ???????????

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    cya ???????????

    I am having problems with my cya. I tested this morning and got a 50 I was outside in the sun with my back to the sun, I tested this afternoon again outside but there was no sun to much cloud coverage and came up with around a 30. I know the 50 was rite this morning cause I poured the solution back in the bottle and checked it about four times and it always came out to 50. Does the sun make that much of a difference on how the test reads?
    24x52 sharkline heritage agp,Hayward power flo lx 1h/p,Hayward s210 sandfilter, and tf100 test kit
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    Join Date
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    Re: cya ???????????

    Yep, there is a fine line between seeing and not seeing the black dot. The sun makes a big difference.
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    Re: cya ???????????

    So I am rite to assume that my reading this morning of 50 tested in the sun would be the correct reading?
    24x52 sharkline heritage agp,Hayward power flo lx 1h/p,Hayward s210 sandfilter, and tf100 test kit
    BBB method and pool rover jr

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    JasonLion's Avatar
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    Re: cya ???????????

    The test outside this morning is much more likely to correct. But you can't be 100% sure. Assume CYA is around 50 for now.
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    Re: cya ???????????

    Thanks. So should I be using the chlorine levels that the pool calculator are telling me to use or the cya/chlorine chart numbers? I am new to this pool chemistry stuff but I feel like I am doing fairly OK. I am loosing around .5 to 1 ppm overnight and around 40 to 50 percent fc during the day and my pool gets between 12 to 14 hours of direct sun in a day. My water is clear and have had no cloudy water at all.
    24x52 sharkline heritage agp,Hayward power flo lx 1h/p,Hayward s210 sandfilter, and tf100 test kit
    BBB method and pool rover jr

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    Butterfly's Avatar
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    Re: cya ???????????

    Quote Originally Posted by dennard
    Thanks. So should I be using the chlorine levels that the pool calculator are telling me to use or the cya/chlorine chart numbers? I am new to this pool chemistry stuff but I feel like I am doing fairly OK. I am loosing around .5 to 1 ppm overnight and around 40 to 50 percent fc during the day and my pool gets between 12 to 14 hours of direct sun in a day. My water is clear and have had no cloudy water at all.
    You can use #'s from the PoolCalculator or the CYA/Chlorine Chart. With 50 CYA, maintenance FC level is between 4 and 8, and never below 4.

    Shock level is between 16 (poolcalculator) and 20 (CYA/Chlorine Chart). Both work, just one is a little more aggressive.
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    Re: cya ???????????

    Thanks for the information I am at .5 to 0 CC
    24x52 sharkline heritage agp,Hayward power flo lx 1h/p,Hayward s210 sandfilter, and tf100 test kit
    BBB method and pool rover jr

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    Join Date
    May 2012
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    Re: cya ???????????

    I am really bad at telling when the dot disappears. So much so that I honestly have no idea what my CYA is- somewhere between 30-50.
    16k gal IG pool with SWG and DiamondBrite finish
    Pentair Intelliflo pump with 520 sq ft cartridge filter

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