Has anyone ever successfully used securely bagged sand or such to provide underwater support for large stones or other features. The big plus is that the bagged material is pliable and will conform to pond side slopes and other irregular liner shapes while the top of the bagged material provides a stable base. I thought about double bagging small bags of sand then using Gorilla tape to firmly secure the outer bags. I also thought about using Flex Seal on the sand bags seams in addition to the additional bagging. Oh, the secondary bags would be shiny black. In my own tests, shiny black does not stand out as much as other colors under water.
Thoughts please.
Thoughts please.