Quote Originally Posted by chem geek
Adding bleach is a basic process; it is the using up of bleach (chlorine) that is an acidic process so the net result is almost neutral.
I am really confused now. Are you saying that my pH should not be changing very much? I use bleach for chlorination and muriatic acid to bring the pH down. I have a 19,000 gallon pool and add about 3/4 gallon bleach a day which raises the chlorine concentration about 2ppm. My pH increases about .2 to .3 units per week, so I have to add about a quart of Muriatic acid each week to bring it back down. I have been doing this for 5 years and it's been pretty consistent. This is pretty common from what I have read on this board. So am I missing something? Should my pH not be rising like it is? Below are my numbers.

FC=4
CC=0
pH = 7.5
TA = 120
CYA = 30
CH = 10
Temp = 83