It's definitely blue now!! Am I right that I need to keep it at shock level until the ppm doesn't drop over night? not even 1 ppm? and CC at 0? anything else? To others dealing with algae and high CYA, definitely replace water if you don't have lots of patience and want to go swimming ASAP. According to my testing, my CYA has dropped to 60. The only "replacement" I did was backwashing and adding water to keep pool full, plus rain. Lately we've been keeping the FC @ 30 - 35 ppm. Even with diluting I could never get my CYA to test more than 100, but it sure seems like it could have been. I've been really busy and away some days so didn't always keep real close tabs on my FC levels and it dipped some. I'm sure that attributed to how long it's taking to clear it up. Feels pretty good to see progress!! Thanks everybody for your help! I really appreciate this forum.