I'm sorry, I'm not trying to be rude. I have seen this question asked over and over and I'm still confused by it. I've only been raising chickens for 2 years now so maybe I'ved missed something I should be doing.
My run is just plain ol' dirt. North Carolina red clay dirt. At one time it was covered with grass but that lasted about a month. Now it's dusty red dirt/clay with bits of chicken poop, a few half eaten tomatoes, squash, and peppers and the litter shoveled from the coop last spring (most of that has washed to one corner where they dig for worms) My run doesn't have a cover. It's too dang big. 40x80ft. When it rains, it washes away the poop. If it rains really hard, it washes everything down to the back corner where they dig worms (neighbors trees back at that corner look fabulous!)
Am I missing something? Again, I'm not trying to be rude, I just don't understand.