Is it possible to ever completely get rid of lice on my chickens? Why do some have lice and others have no visible signs at all. I bought a 50lb bag of DE and have been putting it in the dirt that the chickens like to dust in. I have even dusted all of them a few times. I've done this for about 2 months. I also dust their coop and nest boxes with it. Is there an easier or better way to dust 80-90 chickens and ducks. It can be very hard at times when I have no one to help me catch all of them. Any suggestions would be greatly appreciated.