I just emptied 2-50# bags of play sand onto the floor of a 10x10ft coop. Mostly, to level out the holes they've already made. They didn't like it at first, they wouldn't even walk in it. They kept themselves off of it for most of the day. I don't think anyone has 'bathed' in it either? I have a lot of molting crabby ladies right now, eventuality they'll get used to it? I plan to add more when I can. It was already "nicer" than packed dirt.