Hello,, I have been using the food grade diatomaceous earth since april,, I love it,and have endured no parasite problems! Love the stuff,,,but I am curious to know how many others use this as well,in their coops for prevention of any major mite/louse breakouts. Also,when using it,,I avoid breathing it in at all costs,,but when I do a major coop clean out I use a dust mask to prevent inhaling the dust. I'm hoping this is a good ,safe measure,,anyone else want to join in the diatomaceous earth topic? feel free!