I've read that good grade DE is good to sprinkle in coops and in the run where the chickens dust. I just bought some Red Lake DE with calcium bentonite. I'm sure my hens are getting more than enough calcium in their diets and I have no intention of adding this to their feed. I'm getting ready to clean the coop and was planning on putting some DE down as a preventative measure.Although most articles I've read are positive about using DE this way, one I just read warned against it. I'd like to hear from those of you who have used it and your experiences. I love my girls and one fella and want what's best for them. Thanks for the help!