The TA test can be affected by the chlorine level, R0007 is Sodium Thiosulfate (Yes the same thing that darkroom users, used as film fixer) and is intended to counteract the chlorine in your sample, if your chlorine is really zero, then try eliminating the R0007 or use only one drop, and see if that helps. BTW if your chlorine is really high, then R0008 can turn blue, and using 3 or 4 drops of R0007 can turn it back to green, giving an more accurate test. It's not uncommon for the TA test to turn purple before going red.So I’m testing for the TA and as soon as the sample turned green, I began dropping the R-009, swirling, cleaning off cap, and I’m seeing tiny pink drops when I first started dropping the R-009 solution but water stayed green. 22 drops later the bottle is pink. Does this count as “red”? What am I doing wrong?! It is raining and I don’t have chemicals in the pool yet if that helps. Chlorine level is 0 and I’m getting somewhere between 7.5 and 7.8 pH readings. This TA is so frustrating!! I don’t want to keep dropping it until I run out! Ahhhhh this pool is going to be the death of me lol HELPPPP please! Thanks in advance!