If you can wait until the water temp drops, it would be better--cold water uses much, much less chlorine than warm water does, so your chlorine that you add at closing will last longer, and even when it's used up, the cold water can also help inhibit the algae growth until the water starts warming up again. So...you CAN close it with warm water, but I can almost guarantee that you're going to open to a green pool in the spring if you do, especially if you don't get it opened back up before the water temp comes back up. Of course, if that happens, you can always clean it up with bleach and filtration, but it will take quite a lot of bleach. So..it's really your call, but you stand a much better chance of opening to clear water if you can wait until your water temp drops.
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