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I agree with @Texas Kiki. I use the permethrin spray too and it does a good job on the flies. My coops were loaded with flies but since I have been spraying them on a regular basis this summer during our rainy season there are way less flies. If you have a TSC you can get the dust, premixed spray and the concentrate. I buy the concentrate but I have a lot of coops so I mix it in a gallon sprayer and the wand helps me to reach into the coops better. For smaller places the premixed spray is good. I have had some chicken mites and the permethrin eliminated the mites too and no egg withdrawal period. Good luck...