So I set my filter to run for 6 hours from 7am till 1pm each day, the chlorinator set to 40%, last 3 nights in a row FC came up at 5.5 each time. However, my CYA still showing around 50 area, below it really if the dot is to disappear completely. Should I even bother to bring it up with my FC staying up so well? Plus how is it that I added enough to bring it to 65 according to calculator? I did buy the stabilizer from Wallmart (HTH brand I believe) and also a 3 lbs package from lowes. According to what the packages say it should bring the CYA up it does come lower then what the pool calculator said that poundage would do. Is it possible the calculator uses some stronger stabilizer ??