I performed two bucket tests for leaks, during times with no swimming, rain, or water replacement. Both times I got exactly 1/4" difference between bucket and pool water level after 24 hours. Is 1/4" a significant difference? I'm being careful, and results are consistent.
I think I may have air bubbles in the line returning to the pump, and that's what motivated the tests. Would 1/4" in 24 hrs confirm that suspicion?