I use PDZ in my poop trays it eliminates the ammonia smell and dries out the poop so it becomes unattractive to flies. I scoop the poop daily. I compost the poop along with my garden waste. I hang the fly traps near the compost pile which draws any flies away from the coop and catches them in a trap that they can't get out of. I just throw away the trap as soon as we have the first frost. This 2 pronged approach keeps flies from reproducing. Keep your coop as dry as possible.
