I use construction sand in my run. It's awfully dusty, but I like it for the ease it provides in keeping the run clean. I scoop poop several times a day, and I have almost no flies in summer, and no mud problems. I would love to find something to mix with the sand to help bind with the dust. Also, I'm concerned about the buildup of tiny dried fecal matter becoming air-born and causing respiratory problems in both me and the chickens. Will mixing PDZ and/or DE with the sand do anything in this regard?