Using my TF Test kit for the first time. For the TA test, followed directions: water 25 ml, added two drops of R-0007 (mix), add 5 drops of R-0008 (mix) [water turns green] and then R-0009 one drop at a time (mixing between each). However, the water never changes from green. Test from PS and another kit shows the TA at ~80.
I am cleaning the tip between drop of the ..09. Also the drops seem very small (approx. half the size of typical droplets).
Any ideas? Do I need to mix for 20 sec between drops like for the CH test?