We have 6 chicks in a 8' x 9' coop. The floor is wood shavings, the poop board under the roost is filled with PDZ that I sift daily with a cat litter scooper. They have been in there exclusively for almost 3 weeks since the run isn't finished. Even though we've had some pretty warm weather, there is no odor.
As soon as I can put them in the run I want to add another bag of woods shaving along with a bag of PDZ on the floor.
I thinking of using sand in the run. Even thought it will be covered, when the grass is gone I'm afraid it will become a muddy, smelly mess. I'm hoping the sand mixed with PDZ will work. Maybe add straw, grass clipping or leaves as well.