Couple of things, Richard320, I have not checked on "Effects of Adding Chemicals" section of Pool Math, but wouldn't the Cal-Hypo add other things and affect the pH or TA, despite it raising CH as you stated?
Jason, can you explain/expand your statement "It is best to be careful to always keep the PH below 8.0." Why? If a person SLAMs his/her pool, then it can be assumed that during that time the pH may rise to > or = 8.0, even if it was lowered prior to the SLAM. What then?
"When CH is at the low end of the range, it is best to keep TA in the upper half of it's range to balance things out." Yes, it is an inverse relationship, right? I have found that with my pool (in Northern CA with high CH fill water) that I have a high CH 1000, but a low normal TA 60, which balances things out. This seems to be the natural effect/progression of the pool water. The water is balanced and has a stable CSI. Using Pool Math, one can play with the numbers and increase/decrease the CH or TA to see how that will affect the CSI. In this case, when I increase or decrease them both, it negatively affects the CSI and the water is unbalanced, but when they are inverse the CSI is balanced.