I just got the Cyanuric Acid Standard 50 ppm solution.
Added Standard 50 ppm solution (R-7065) to the sticker, then added CYA Reagent (R-0013), shake wait 30 seconds, shake again, then test. Sun to my back at waist level.
Ran the test 2 times with new reagent each time. Both times, the dot disappeared at 40 ppm, not 50.
I know there is a swing factor but if I am off by 10 and then a swing factor of 10, I could be off by 20 and that could have a impact.
Should I just relabel the CYA test tube?