Good news! No more flies. I increased the clorox mixture to the water and had a field day spraying the flies lol. The next day there wernt as many and I sprayed again. The spray even took care of some fire ants. Like I stated in an earlier message here, I raked the areas I sprayed to turn the soil over and prevented the chickens from entering the pen til later in the afternoon. Everything worked as planned and no more pesky flies.