I live in the Atlanta area, and even here, some people don't cover theirs. I do. It just kind of makes it maintenence free while it's too cold to swim. The only maintenence to be done after it's covered is occasionally getting the water off of the winter cover. And, unlike most, I syphon mine off as opposed to using a pump. I've got a piece of garden hose with a weight duct taped to the end. Anyway, I clean my pool really good, shock, then cover when the chlorine level gets to the high end of the scale for the amount of cya you have. Then, being an above ground pool, lower the water level to below the return, then cover the pool. I unhook the hose from the return, and cover the return with a piece of duct tape. Drain the pump and filter, and that's it.
There is nothing wrong with keeping it open in your area, in my opinion, but you'll be cleaning, adding chemicals, etc. all winter long.
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