Chlorine and calcium low

[aylad]

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

[nthach]

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.

[aylad]

yes, but they are usually enclosed in plastic, and you cannot use them in a chlorinator.

Janet

[waterbear]

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

cal hypo tablets cannot be used in an unvented erosion feeder! To do so is dangerous. There are special cal hypo feeders available for cal hypo tabs .
Also you should NEVER mix trichlor and cal hypo. It can cause an explosion!

There are several brands of cal hypo tabs besides the PPG ones but they all dissolve rather fast so they are not suitable for erosion feeders. They are used in skimmers or special vented feeders.