With a CYA of 100, your shock level would be about 25ppm. Let's see if going up to shock level will get you past this chlorine demand faster. Instead of adding bleach multiple times per day, add enough this evening to get back up to shock level. An hour later, test and record FC and CC and then within an hour of sunrise in the morning, test both again. In the morning, take it back up to shock. Just try and add enough bleach morning and evening to take it back up to 25ppm instead of trying to add bleach so many times per day.
I know this is frustrating. We see this on some pools every year. High chlorine demand that seems relentless and seems as if it will go on forever. It is usually the result of CYA biodegrading causing byproducts such as ammonia that you have to get rid of. I know it feels that you'll never get past it, but you will. Hang in there.
Bookmarks