We use pine shavings in the coop and nesting boxes, and sand in the run. We love the sand! We only fully clean the run about once a month, and even by then we have very little smell. We drilled holes in an aluminum scoop shovel and use it to scoop and sift the poop from the sand. Takes about 30-45 minutes to do a detailed sifting of the full run, and our run is about 7'x14'. It's great because the chickens are able to dust in the sand in the run, and the sand dries quickly if it rains so there's never a muddy mess. We put drainage pipes in under the run to drain off any excess water when we were building our coop and run, and we have a 4"-6" base of sand in the run.