I've seen some posts that folks put a few inches of (play?) sand in their runs to help with drainage. Do you just use standard play sand or gravel or what? i hate taking people over there on a wet day as they tend not to want to wear clothes-pins on their noses so I need to come up with something to help control the run skeevey smell. it's not an option to cover that part of it (can't support the winter snow we'll be getting). Do you need to periodically remove the sand & replace it like the sawdust inside the coop (for the love of God please say no; what a nightmare THAT would be!). Any tips to control the smell, actually both inside the coop & the run would be great. I've been doing this 6 mos & the worst part of being a chicken momma is my kid's smell!