My own experience from living up North where it was necessary to close a pool for the winter is that the only thing the chemicals clean out is your wallet. I remember having to put the big air pillow in the pool before covering it for the winter and then struggling to open the pool in the spring. By the time you're done with shocking the pool and adding the other stuff, you've got an expensive toxic soup that still doesn't look right. Much better - and cheaper - to bite the bullet, drain it, clean it, and refill it each year. The cost of the water is probably going to be less than the cost of the chemicals, plus there's less aggravation.
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