pH should almost always be between 7.2 and 7.8 but the level of chlorine you need is dependent on the level of CYA you have.

Post a complete set of test numbers to get meaningful, specific replies. The chemistry gods here will need your free chlorine (FC), combined chlorine (CC), pH, Alkalinity (TA), calcium hardness (CH), and cyanuric acid levels (CYA).

Post those and you'll get loads of help.