Old thread, but exactly what I was looking for. If I want to raise my CYA from 30 to 35 (or 40), all I need to do is chlorinate with pucks for a few days (since I have spares laying around), right? Maybe 4 or 5 days, turn off my Clorox feed and throw the plastic puck float in the pool (or run them through the auto-feeder). Don't want to buy CYA if I can use up old tablets.