Hi Corinna,
I've used two different CYA tests. One, the Taylor from my test kit which uses 14 ml water and 14 ml CYA reagent. The other was a CYA test I bought at Leslie's, called Blue Devil. It had a larger test cylinder but still used 1/2 water and 1/2 reagent.
My conclusion is, the reagent is the same. The primary ingredient is melamine. I bought a pint of the reagent from Amato Industries for $6.86 plus shipping. I've used it in both test cylinders with half water, half reagent, and the results came out the same.
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