Hello everyone. In my never ending quest to find bentonite in Portugal, appart from a beauty shop for 20€ 2 pounds, I resorted to granulated bentonite used for Cat litter. 2€ 8 pounds . After going Daniel San, wax off wax on with a 6 pound slice of round steel, for a few hours, my back started to complain, and I only crushed about 1 pound. I decided to pour the entire content on top of a 1/4 inch steel plate and run a cylinder back an forth over it. It worked like a charm, and crushed 7 pounds in 90 seconds to a very fine powder, and nearly no effort. I hope this helps someone with the same problem.