Just to update (and hope for some replies): Found a crack in the skimmer, just by the outlet pipe. I can stick a screwdriver in it to lift it. Filled the skimmer with water to see what would happen. Water drained out (I checked about 2 hours after, so not sure how fast it drains). Could this be the culprit? Could this have been a hairline crack before that widened? Going to try some JB Water Weld and pray
Also, should have noted: The pool is inground and vinyl.
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