Quote: I have to use DE every single time I clean the coop (every 2 weeks top to bottom) at first I started using it for mite control, and now it is just part of my regular routine since I have found it helps keep down the flies and makes the soil easier to work with when I rotate it.The animals don't mind & I like using it as a preventative. I have a small coop & run, so a 50lb bag will last me a long time & is way more cost effective than a smaller bag.