Are there two different tests in the TF-Pro test kit? I’m just going by the reagents and the laminated sheet. It says 25mL pool water, 2 drops of R-0007, 5 drops of R-0008, and then single drops of R-0009 until pink. Multiply drops by 10 to get TA.I might suggest doing the TA test with the 10ml sample and adjusted drop counts. Or at least double check you aren’t using the 25ml size with the 10ml drop counts.