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Hi folks,

Bobbi wrote:
> He looked startled, and said it was a kind of clay used to line
>landfills (he works for the Maryland St. Dept. of the Environment, and
      spent several years in Solid Waste Management).
Bentonite is also used as a clarifier when making home-made wine.  It is
definitely a type of clay.  It bonds to suspended particles and pulls
them to the bottom of the carboy.

Pat in Toronto