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Not sure you ever clarified: do you have an in-ground or an above- ground pool?
Losing two feet overnight, for an in-ground pool there’s no way other than pumping out. Do you live in a hot climate? Even with evaporation it loses about a 1/4” per day at most.
Unless, there’s a break in your filter pipe and you have a pump that goes on once in a while and all the water is returning to the ground instead of to your pool. But you’d notice that I think.
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