Pond Boss Forums POND CONSTRUCTION Building a dam Success with bentonite?

I had a sizeable leak in my dam that originated near the surface on the pond side and exited at the bottom on the back side of the dam. I lowered the water level until the leak, which I could hear slurping, was at the surface and slowly poured bentonite powder from a coffee can into the hole. After about 3 cans worth the flow slowed noticeably and I didn't add any more. I drove a stake into the ground to mark the spot in case I had to go back and re-treat it but that wasn't necessary. The leak is gone, the bottom of the dam dried out and it hasn't re-appeared in 2 years. I keep a 5 gallon pail of the stuff in my garage because it seems to work very well.