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Thread: CYA

  1. Back To Top    #1

    Join Date
    Apr 2010
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    CYA

    Hi Everyone,

    First I have to thank the answers I got on this site my pool is better then ever. One question- my CYA has been creeping up. It was 50 now its 70 I am using bleach. What causes the rise? The pool calculator wants me to replace 43% of the water. Im thinking I should do a CYA test on my fill water first.

    Thanks,

    Kenny
    13K gal, Vinyl, 24' x 52" AGP, 1 HP pump, sand filter, 75 GPM, Chlorine

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
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    Re: CYA

    Your fill water doesn't have CYA in it. CYA is added only in stabilized chlorine like trichlor and dichlor, or directly in stabilizer/conditioner.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. Back To Top    #3
    Butterfly's Avatar
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    Re: CYA

    Testing error? What test kit are you using?
    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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  4. Back To Top    #4

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    Re: CYA

    Quote Originally Posted by Butterfly
    Testing error? What test kit are you using?

    TF 100


    and I try to see that black dot .. you know if you look real hard you may be able to add more fluid and bring the CYA down .. it is a funky test i guess as good as your eyes are
    13K gal, Vinyl, 24' x 52" AGP, 1 HP pump, sand filter, 75 GPM, Chlorine

  5. Back To Top    #5
    Butterfly's Avatar
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    Re: CYA

    Well, as JohnT mentioned, have you added any stabilized chlorine?

    You could order a CYA standard solution test to verify your CYA test results.

    Consistency in testing is very important, like testing around the same time of day in the same lighting.
    Here's Taylor instructions w/pics for the CYA test: http://www.taylortechnologies.com/Chemi ... ntentID=36
    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!

  6. Back To Top    #6

    Join Date
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    Cupertino, CA
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    Re: CYA

    I find that wiggling the tube a little helps me identify the black dot when it's mostly obscured but not completely.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  7. Back To Top    #7

    Re: CYA

    Another suggestion is to do the test, then pour the water back into the container and do it a second time. Then pour it back and have someone else do it; don't tell them your result so you don't bias their findings. The two of you should get more or less the same result.

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