If you're filling from a well, and have metals in the well water, then I would do whatever possible to clean up the water you already have so you don't have to drain/refill. If metals isn't a problem, and you are able to drain and immediately refill, then it might be worth it to go ahead and get the pool closed so you don't risk any of your equipment to freezing. Your call....but if you don't plan to drain/refill in the spring, then you really need to get it cleaned up before you close.
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