Isn't that used somewhere in the gas fracking process? According to the greenies it's deadly poisonous and highly dangerous. You wouldn't want to be stopped by one of those buggers with bentonite in your sock, would you??
Actually, I don't like the clay litter. Makes far too much dust. At least it does with a rabbit jumping in and out of it. Far better to use the wood pellet (compressed sawdust) type, even if it is a bit dearer.
Used to get it from the supermarket for my daughter's varmit. Trouble was the stupid bastards at Sainsbury's started to send me cat food vouchers. I HATE CATS YOU INBECILES. Well done, cretins. Insulting your customers.