Testing with high TC

[waterbear]

And with the ProTeam borate titration, a high TC level bleaches out the indicator.

Which is why I usually use the LaMotte Borate strips! The color change in the Proteam indicator is just plain hard to read, bleachout or not! If memory serves correctly it is bromphenol blue. I do use the Proteam titration kit when I need to make adjustments to the borate levels (perhaps once a year) but the strips are good to tell me I am in the 'sweet spot' of 30-50 ppm!