I saw that somewhere, too, and posted that info.

Pooldoc immediately posted back and said, 'DON'T USE IT!". It is apparently an invitation for an algae bloom.

I agree your CH is high but I think your cure may be the Cl and stabilizer you have already started to apply.

You need your own test kit that will test for those things (as well as pH, Alk, and combined chlorine)....don't rely on the inconvenience and unreliabilty of pool store tests.

I'd leave the CH alone for now. If the Cl and increased stabilizer don't ckear it up, post back and you'll get more help.