Sorry about your troubles. A stony bottom is never a good thing, and usually requires a good, thick layer of clay put down in lifts and compacted to stop it from leaking. One crack in that rock could be connected to many others down below.
Have you considered instead a large rubber liner? It may be an expensive initial investment, but almost guarantees the pond will hold water.
Last edited by liquidsquid; 07/20/21 02:30 PM.
