My run has fill granite in it. It is the cheapest stuff the local quarry sells. Sand was around $25 a ton and crushed fill granite was $7.50 a ton. It is sand-like. Has lots of grit the girls need and drains pretty well. It compacts nicely but they can also dig in the stuff and get a good dust bath. The poo can be raked up if you want to or will break down with mositure. I like the stuff.