Hello my name is Kelly. We live in Rockford IL. We have a 23k gallon in ground that opened 2 weeks ago. We got to jump in as a family a week ago while my step son was visiting on his spring break. I turned the heater off after he left and have been trying to get our CYA levels down. Opened at 300 currently at 225. Have drained a little and filled a little. Maybe 3 times total. I think the previous owners must have used only pucks. The app and pool school has been so helpful.