We live in central CA it can get as cold at 30 in the day but i never snows here. Last year we had rain for almost 3 weeks straight but other than that mild winters. I went to two pool stores and one said you must take it down the other said no way you will shrink the liner just get a winter cover. He said keep it chlorinated and keep the pump on it and run it like once a week. So what should we do?