The pond is roughly 21000 sq ft of surface area. I ordered 10 Tons of 3/8 inch chip bentonite (actually have a ton still left). So I did a little under a pound per square foot. I have reasonable clay but there where some sand areas in the bottom of the pond that I hit with more bentonite than the rest. The 10 tons was delivered in 50 pound bags was roughly $3,400 dollars. I ordered it from a mine drilling supplier in IL and they delivered to site.
I could see if you have a couple acre pond and sandy soil requiring a couple of pounds of bentonite pre square foot it could get pricey.
Was wondering about the concept and if bentonite would help
