Quote Originally Posted by labdi01 View Post
My only concern about my numbers from the Taylor test is there were 2 incidents where the color they described was not the color I got - but adding more reagent didn't make a diff. Example - in the TA test, my color was supposed to change from green to red. I got more of a magenta. The calcium test said solution should turn blue. I had more of a indigo/purple.

With a CYA of 50 - I removed the CYA sock from the pool (this am pool store told me my CYA was 100 - but I did Taylor twice and got 40 and 50 respectively).
For what it's worth, the color palette you describe for the end-point of the Total Alkalinity (TA) and Calcium Hardness (CH) tests match that of my testing.

TA test titration ends in a dark magenta (not red)

See http://gizmodo.com/assets/resources/2007/11/magenta.jpg

CH test titration ends in indigo / lavender (not blue)

(I'm not aware of any particular reason for these discrepancies and have tried performing the tests in every way recommended by Taylor and others, but the results are invariable and have been for 3 years.)