How much CYA did you add?

The pH test is inaccurate with chlorine that high. Mix a sample with half pool water and half distilled water and then rerun your pH test. (Do not multiply by 2 or anything like that. Just read the result.)

Keep at shock level but not as high as you have it now. Reread the Best Guess chart below. You can leave it on recirculate if you want but when the algae is dead, it is your filter that is going to remove it.