Hey guys been reading threw pool school and getting all the information I can to do the BBB style, so far my pool is clear and the fc level is around 6.5 to 8.5 on average. I test everyday with the tf-100 kit, great kit makes it so easy to know what is happening, but anyway I brought my cya level up to 40 by using the solid form of acid in a sock placed close to the skimmer. my question is that my pool is exposed to ten hours of sunlight a day and there no shade in the back yard @ anytime during the day. should I increase my cya level say to 60. I know on the chem geek's chorine/cya chart that a cya level of 70 should have a target level of 8.0 fc.right now I put a 1/2 gallon of bleach @8.25% every evening. when you have a cya level of say 60 is ok to fall a little short on the target fc or should it always stay right@ target level.