I found some food grade DE locally and bought 50lbs of it to use for dusting the birds, coop, etc. My chickens often are seen pecking themselves under their feathers, wings, etc so I assumed they had mites. So, I dusted the coop floor and the bedding as well as the nesting boxes. I then dusted the run and each bird. Well, today when I opened the door to let them out, it was dusty in there from the chickens scratching the bedding, etc.. What are the problems if any with breathing food grade DE dust? Not only did the birds breath in this dust, so did I and my daughter. I decided to sweep out all the bedding and clean it all out so it's not dusty in there and replaced all the shavings and straw. While doing so, I was exposed to airborne DE dust. About the food grade DE, I thought it would kill mites/lice, etc but someone says no, that I need poultry dust or sevin, etc.. So, today I grabbed some poultry dust and I tried to get each bird dusted best I could, but doubt it was a good job. How often should I dust them with this to get rid of the mites? Does DE kill lice/mites, etc or just prevent them?