Pond Boss Forums POND CONSTRUCTION Building a dam Water leaking under Dam. Pics.

I've been told by professionals that the bentonite never works. I'd be very cautious with that approach, especially with water already in the pond.

Trying to get bentonite to drop on top of a "possible" leak and plug it would be like dropping a bare hook into the water and expecting to hit a fish on the head with it. Chances are slim.