Originally Posted by Left Hand Percherons
And the bag of DE I have says it's Calcium Bentonite.
And sodium bentonite is kitty litter, but one is not a substitute, or interchangeable for the other. Neither is bio-sponge. Considering how DE works, I personally, would not use it on any horse that had intestinal or gastric upset. Doing no harm is not the same as doing any good.