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Thread: What is the reagent in the CYA test?

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    What is the reagent in the CYA test?

    In Leslie's FAS-DPD - does anyone know?

    I am going to do a drain/replace to reduce my CYA but I am going to run out of reagent very soon (because you need to use 7 ml per test!)

    I had to do a 50:50 dilution with fresh waterool water to get what I hope is an accurate CYA, and its between 160 and 180 (Trichlor I hate you). So I am planning on a 50% replacement
    very plain 1966 Rectangle, refiberglassed in distant past, 15K gall, Pentair 320 Cartridge filter
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    Re: What is the reagent in the CYA test?

    R-0013.

    Good luck.
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    Re: What is the reagent in the CYA test?

    It's melamine, with a buffer at low pH. You can get 8 ounces (4 larger bottles) for $15 from tftestkits.net.
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    Re: What is the reagent in the CYA test?

    Hi Richard
    I have a CYA test kit that says Cya test solution by Blue Devil Pool and Spa. Is it the same stuff?
    Thanks Steve
    20K gallons,plaster, IG, Posi Flo 100 cartridge filter, 3/4hp pump. , Polaris 280?

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    Re: What is the reagent in the CYA test?

    According to this MSDS file Blue Devil Cyanuric Acid Test Reagent is a combination of melamine and sodium acetate. This would appear to be a higher than neutral pH (unless they also have acetic acid as a buffer solution and neglected to list that) so this may be different than the Taylor reagent and may produce a different result in a turbidmetric test. That is, the view tube may be uniquely calibrated for this reagent. For comparison, the Taylor R-0013 reagent has this MSDS.

    You can get just the CYA test, with view tube and reagents, from tftestkits.net here at a very reasonable price.
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    JasonLion's Avatar
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    Re: What is the reagent in the CYA test?

    The Blue Devil CYA reagent and view tube are different than the Taylor CYA reagent and view tube. The procedure for the test is nearly the same, but the markings on the view tube are at different heights, so the parts are not interchangeable between the two brands.
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    Re: What is the reagent in the CYA test?

    Quote Originally Posted by Solvangswimmers
    In Leslie's FAS-DPD - does anyone know?

    I am going to do a drain/replace to reduce my CYA but I am going to run out of reagent very soon (because you need to use 7 ml per test!)

    I had to do a 50:50 dilution with fresh waterool water to get what I hope is an accurate CYA, and its between 160 and 180 (Trichlor I hate you). So I am planning on a 50% replacement
    I bought a gallon of it from leslies for under $25 and keep it stored under the counter in the AC.

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    Re: What is the reagent in the CYA test?

    Very good - I will go to Leslie's and get a gallon!

    thanks
    very plain 1966 Rectangle, refiberglassed in distant past, 15K gall, Pentair 320 Cartridge filter
    Dolphin Diagnostics cleaner (the best!)

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    Re: What is the reagent in the CYA test?

    Quote Originally Posted by -=PEAKABOO=- View Post
    I bought a gallon of it from leslies for under $25 and keep it stored under the counter in the AC.
    And for the record I am still using the same gallon and it still seems to give proper readings when testing.

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    Mod Squad jblizzle's Avatar
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    Re: What is the reagent in the CYA test?

    Well, we often say that the CYA reagent is the most stable ... although not sure we would have said 9 years
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