you told me to wait 3-4 days to re-test CYA and i'm following your lead because i'm new to the pool care club. i still have much to learn and i keep reading info on this forum. what are good number ranges for Cl, PH, TA & CYA. i live in north Alabama-hot and lots of humidity and we live in the valley so we get all the pollen and crud that settles all around which is why we get plenty of head colds-sinus infectionville.