We have had our pool/house for 2 months and now fall is setting in. We went for what seems like our last swim this weekend and the water was down to a chilly 72, with no heater this year it looks like the end is here. My question is do I need to maintain my Fc level until I winterize it? Once winterized is it really ok to let the water freeze in the pool and main drain? So many questions with it being my first time winterizing, but more later. Thanks