Pond Boss Forums POND CONSTRUCTION Soil questions Bentonite!!

big pond - Betonite that I've used is a very very fine white dust refined from clay. It can swell up to ten times its size when wet. There are two main types of bentonite but one of type is used primarily for sealing ponds and making soil more impervious to water passage through the pores. Betonite is also availabe in sheets abt 4'x8'. Most well drillers know where to get betonite since they frequently use it. Other speciality contractors use it. Look in the yellow pages under bentonite you may get lucky.
I cannot tell you where to look in your area because you did not include where you live in your PROFILE.