The pool is crystal clear and I'm keeping the chlorine up high. I know my ph will change when I do a refill but why else would it go down. I'm having trouble keeping the ph up, it drops to low 7's, I add borax and it goes up to good range. Still losing a lot of chlorine. If I have an algae trying to bloom, would the high cya reduce the effectiveness in the bleach killing the algea?