It got cold in central Illinois quick and I don't have a heating system either. We were pretty much done around Labor Day. I shut the pump off and before I knew it, the pool turned green. I don't plan on putting a cover on since I don't have a lot of trees around.

Do I need to put something in and circulate? I use BBB. I'm confident that I can get it all clean in the spring with no problem. Am I wrong?

Our electrical rates are going up by 55% next year. It'll be uneconomical to run a pool soon. I switched to running pump ~8hrs/day.