As I said, I do not close. But it seems to me from all that I have read on TFP is that, if you're willing to tough it out for a few weeks maintaining a cold pool that no one wants to swim in and you close the pool below 60F, then you've got a greater chance of not having green water. This would also assume that you open the pool before the water temps hit 60F as well.
So isn't it really water temperature (and good closing SLAM) that makes the difference? That's how I see it.
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