And Blooie would know, bentonite all over her area. Maybe she can send you some.You need bentonite lining that pond. Nothing gets through that stuff! It’s soft as talc when dry......if you get stick in it you ain’t going nowhere. Wet it’s slickery as all getout -if you get stuck in it you ain’t going nowhere. It’s used to line wells, ponds, ditches, landfills (required in landfills...ask me how I know THAT), as a binder in some cosmetics, chocolate, and even ice cream.