We do clean our coop daily and we turn in the poop in the run as well at the same time, but still 30 chickens is a lot of poop!!! And that makes for a lot of flies. It didn't occur to me that would be a problem since we didn't have the problem last year at this same time. But then last June we had only 12 hens. We didn't add the next group of 7 until after Labor Day. Now we have 30 and all they do is eat, poop, and poop some more. Oh yeah, and lay eggs... But yesterday I took everyone's advice and got a couple of 10 lb bags of Diatomaceus Earth. It's not easy to find here in the Carolinas. I finally found a small hardware store in Statesville that had a couple of bags of it for $4.95/Bag. The owner said he could order me a 50 lb bag for $40 when I needed more. It's the food grade type. Anyways, we cleaned the coop last night while the Gals were out free-ranging and I dusted the shavings with about a pound of DE afterwards. We also powdered down the run (18'x22') with about 5 lbs of it as well. Hopefully all this will help with keeking down the flies.