What is it? DE (Diamectious or something like that, earth) is fabled on this fine web establishment as being hard to find, expensive, and is the best thing you could ever spend your money on for your coop. DE will kill mites, absorb moisture, and the chickens love to take dust baths in it! It will also reduce ammonia, smells, and other little beasties that haunt your chicken coop. To find this wonderful product... Go to your local Tractor Supply. Purchase a 10-25 lb. bag of Stall Dry (for horses) for less than 15.00. Be happy. P.S. Many people are mail ordering this wonderful product, but why spend $50.00 for something so readily available and cheap? Happy DE Hunting! PS. I forgot to add that it is specified for horses and chickens, and in the ingredients it plainly says Di-a-whatever earth in the ingredients, along with clay.