Okay, I was thinking if we would do sand, I would scoop out all the poop and if pea gravel I could hose off with the garden hose, but drainage would privabky be needed in both scenarios... then I also have to think about cost, we don't have too much extra to spend right now. Wood chips sound like a good option how often would they need replaced? I've never done much for their run as far as their flooring went I used to free range all the time but now that we have a dog that's not chicken friendly, they won't get to come out as much.