I use DE in my barns to control odor as well as flies, mosquitoes and any other insect/bug/parasite that might take up residence in my barns. I know some have stated that the DE isn't keeping up with their problems this year but for me it is working perfectly well. I keep my barns dry and use a fan on hot days. I use the deep liter method and turn over the mix of shavings and hay as needed. I keep DE sprinkled liberally over everything and everywhere the chickens go. I put it in their feed. I keep their dust bath area well powdered too. My chickens are very healthy, friendly and alert. This is one of the RSL cockeral that came this spring as a packing peanut. He is 10 weeks old this coming monday. This is a selection of the fly strips in my barn. They have been hanging since May. I fully believe in using DE. If you have never used it you should really give it a chance if you are having odor or fly problems. Using the DE also is a natural wormer and is very healthy for the chickens. If you have never used DE please understand you must ONLY use the food grade product. It may read as codex grade fossil shell flour. I use Perma-Guard brand. It is 100% DE. Good luck. I hope you have clean smelling and fly free coops ASAP. Updated to add - I buy my DE through dirtworks.net. The shipping can be expensive but so far they have the best shipping price to my door. Note - One key to the success of DE is keeping the interior of your coop dry. My waterers are located near the door and are set up on level blocks to keep anything from spilling or splashing. I cannot stress enough about keeping the roosts, floors and bedding as dry as possible. Also notice no flies on the strips - just a few moths that must have been attracted by the lights at night.