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  1. T

    CYA Reagent R13

    Bought on amazon from seller with good reviews. I tried shaking bottle and did 2 seperate tests. We did get a foot of rain last week but I didn't think we'd lose that much!
  2. T

    CYA Reagent R13

    Hi All, Is it possible for the Taylor reagant R13 to lose effectiveness but still be within expiration date? I bought a refill bottle online and the expiration date is 6/20 but when I tested it appears that my CYA has gone from 60 to less than 30. This is the first time I've used from this...