Quote Originally Posted by aylad View Post
IF it's an inline chlorinator, the only kind of tabs you can put in it is trichlor--but don't get the "dual acting" ones, because the "dual" means they've added copper. Watch out, though, because it will lower your pH, and yours is already on the low end. It's okay where it is, and you don't necessarily need to add any Borax, but just make sure the trichlor doesn't drop it below 7.0

Janet
You can also buy cal hypo tablets too - I know Leslie's can order it from PPG.