Since Thursday and the incremental addition of muriatic acid, the pH has come down from 8 to 7.2, but, alas, the TA has only come down from 150 to 125. Now that pH is so low, how do I bring down the TA? And, the CH is at 450! How do I bring that down?? Tech support from Taylor Kits said there may be copper or iron in the water, preventing the calcium test to render a true blue, and suggested I add additional titrant R-0012 before the test, which I did and the end was still purple. Lots of metal, perhaps? Calcium, Alkalinity, and Metal, O MY!