You say you occasionally add bleach to get your chlorine levels where it needs to be, but what is your normal source of chlorine? Are you using Cal-Hypo either in an inline feeder or a floating feeder or adding it manually? Your CH is probably rising due to using Cal-Hypo which for every 1 ppm Free Chlorine (FC) it adds, it also adds 0.7 ppm Calcium Hardness (CH).
Richard
Bookmarks