That's what I would suggest in addition to the DE. Turn the run, the chickens will help and they love it. It gives them something to do. If the dirt is really hard, work some sand in it to help it dry faster after a wet spell. Not that we would know about that here in MD. We haven't had rain in weeks and weeks, I've lost count. So ours is a dust bowl for sure. I went and bought the girls a box fan today. I hate seeing them so hot.