My pool is roughly 29K gallons IG, and I keep my CYA at 89-90 (intentionally), and my Cl stays around 8-9. My pool receives moderate to heavy usage daily during the summer. I usually add a 3 qt jug after the swim day is over, and I shock it on the weekends. On less busy weeks, I add one of the big WalMart jugs about every 3 days.

Janet