Pool is crystal clear, autocover is closed except when I am checking things, zero bather load and I have passed OCLT. FC is up around 16, and I have been bringing the CYA to my target of 40. As I have brought the CYA up over the last week, it seems like adding CYA makes the FC go down a bit. FC was nice and steady, I added CYA to go 5 to 25 over a couple days (in a sock), and FC dropped a couple while I was adding. Once CYA was all dissolved, FC was steady a couple days again. Then when I added CYA again to go 25 to 40, the FC again dropped a couple. Is the CYA tying up FC or something?