Pond Boss Forums POND CONSTRUCTION Soil questions bentonite question

I can't comment on how likely it is a leak will be fixed by pouring bentonite into a pond, but the stuff can't be toxic to fish. At the first PBCon, Overton's big fish tank had sprung a leak. Todd & Clint were dumping in bentonite, thick enough that the water looked like it was half milk, hoping the leak would stop. The whole time all the big, beautiful fish Todd had in the tank swam around AOK.