Hey Everyone,
I’m working on building a 1 acre swimming pond we are in an area with heavy clay so we are doing a natural bottom with no problems there.

I want to and sand to the bottom to help keep the water clear and make it nicer for swimming. I have read that the sand will just disappear into the clay. I was considering just putting down a heavy visqueen sheeting between the clay and sand to help provide support for the sand. Any thoughts or ideas on how to do this better?