Thanks Dave. Thanks TGW1.
I think the trick is to get a solid layer laid over the area, as you said TGW1. I'll spread the bottom, especially the bedrock, with a heavy layer. It's possible to cover the betonite with soil, but it would be a heavy chore. I can easily cover it with hay bales. Do you think the hay would work as a "lid" for the bentonite. And as a corollary question, is there anything wrong with putting hay in the bottom of a pond?
Thanks for the advice guys.
