I have just purchased a home and it has an IG concrete pool. I am very new to the pool game and have been reading up on pool school and in forums on here. I live in Wisconsin and it is not pool weather as of yet. However, I would like to get the pool up and running for the summer. I'm not sure what the previous owner has done for upkeep, but I see they have a Frog revitalizer system. I have read enough on here to know that I am going to get rid of that. The pool is full of water and I'm not sure where to go from here. Is my first step emptying some of the water to shock the pool? Any tips and pointers toward where to begin are greatly appreciated.