I switched from pine shavings to river sand in my 2 coops this past weekend and I can already tell the difference. Of course the first night the chickens were freaked out because something "looked different" in the coop so I had to spread a very light layer of pine shavings over the sand to get them to go in. I am telling you in the 4 days since I made the switch there is less odor and the coop is so easy to clean. Will put sand in the run over time. Definitely feel it is a much cleaner environment as well. The chickens have adjusted nicely.