Pardon - I was only speaking quite generally, that acid in solution is a effective antichlor and in fact is used that way in other processes. I'm a complete neophyte to pool chemistry however, so it's safe to ignore me.With your name and your signature, I'm not sure if I should take your comment with a grain of salt. (eh!?) I am not even sure I understand what you are saying- that by adding acid to bring it in to recommended range I am causing the chlorine levels to go down? Hmmm....