A lot of people just let CYA drift down through the season until they take a week or two vacation. You'll hear it called "Saving their CYA". The idea is to start the season with 50ppmCYA then let it drift down to 40ish or whatever. Then just use PoolMath to figure out how many pucks it'll take bring your pool back up to 50ppmCYA. Load them up in a floater, toss it in, and go on vacation. Then no need to worry about FC dropping as the tablets dissolve so slowly and the whole time you're just bringing up CYA to the desired level.
