I've been reading tons of threads about using sand in the coop and I think it's definitely something I'm interested in trying. 1. Is this the type of sand I need? http://www.homedepot.com/p/Quikrete-50-lb-All-Purpose-Sand-115251/100318450. 2. Of course I'll be sifting poop out every day but how often should I completely change it and put in new sand? 3. What do you do with the old sand? 4. I read that you can wash, dry and reuse the sand. How would I do that? 5. How does the sand work in a run? I'm worried they'll burn their feet in the summer and freeze their toes off during the winter. Thanks!