Just be aware that the package may not say "Food Grade" on it. I recently bought a 1 1/2 lb. bucket of DE at my local co-op that only said "organic non-plant food product" on the label. The guy at the co-op told me they carry it for people that garden organically and that some folks give it to their dogs for worms. I called the company to be sure before using it. It is indeed food grade and they sent me an e-mail statement to back it up. It wasn't until I actually opened the bucket that I found the instructions inside. It's sold under the name Earthsafe Organics. If I were you, I'd call or e-mail the company before using it. Tell them specifically that you want to use it around your chickens.