I use straight PDZ as the bedding, but I'm new to chickens and not sure you're really supposed to. I've been scouring this site and haven't really found a definitive answer. There are definitely people using sand + PDZ as the bedding. The Chicken Chick does it. You can do a search for "sand"...
I'm just using a couple inches deep of straight PDZ in my coop. One bag filled my tiny coop. It works great; easy to keep clean with a kitty litter scooper, and no smell whatsoever. My chicks are still so small that they sleep on the floor under the heater so really, the coop is functioning...