I have decided to run my pump and SWG throughout our Winter here in the deep South. We don't get very many really cold, cold days either. But, I want to cover the pool to keep out leaves and dirt and such. Do I need to bring my chlorine levels up to shock level or just leave it balanced? Also, what will the chlorine levels do since the pool will be covered and won't get any sunlight? Do I still need to test the water periodically? I did not cover the pool last Winter and had a lot of debris and leaves to clean up when opening this past Summer. Just trying to avoid that but don't want to have to deal with green water either.