I'm currently trying to rid my pool of a small algae issue and have a question about "shocking". My CYA is ~70-75 so according to the Pool Calculator my shock level is 20-21. When I bring the FC level up to 21 and it then drifts down into the 12-17 range during the day/night, am I still "shocking" the pool (just a little slower)? Or is all that time below shock level being wasted? At what FC level (relative to CYA) are you still gaining ground and killing algae? Or are you still gaining until it gets down below minimum FC levels?
Thanks...
Thanks...