Keep in mind that high chlorine levels will give falsely high pH results, so I would not adjust your pH unless your Cl is lower than 10. That being said, with a CYA of 70, you need to bump your Cl up to 20-25 in order to kill the algae. You need to keep it there by testing and adding more to get back up to that level, 2-3 times daily if possible--the more consistent you are about keeping the Cl up, the quicker the green will clear.

Janet