Quote Originally Posted by labdi01 View Post
With TA - I added 3 more drops - no change. I'll add more next time (too dark outside now).
I responded to your concerns about CH and TA end-point colors in the following thread

http://www.poolforum.com/pf2/showthr...?t=9765&page=2

Magenta may indeed be the appropriate end-point for the TA test.