Catokay Ultra Cat Litter 5

Great stuff! But what is it MADE of? Says it is nontoxic. But is that if ingested and inhaled? It's a little dusty at first (kitty and I were coughing). But it is very clean. When I pop those poops into the toilet the little pellets of Catokay fizz like bicarbonate of soda (all very interesting to the kitties, of course).