All I can tell you is I just put a cup or so in the top of a bag of feed and stir it around. It works to kill any bugs that are already there or that crawl in later somehow. And dont worry about controversy. Some people do seem to think DE does everything short of curing cancer, but I'm not one of them. I like to use a safe bug killer around my birds. If you dont overdo it, they wont be inhaling much. It can make things too dusty in your coop when added to the dander, etc. if you put in too much. As far as worming, some say it does, but if you wet DE, it loses lots of its cutting ability. If it's inside an animal, obviously, it will be wet, so you see the issue there.