Sweet PDZ is sold as a stall freshener for livestock, usually found with horse products.
According to the
manufacturer, "
Sweet PDZ is the leading stall freshener on the market and is the odor control and deodorizer of choice for thousands of horse, pet and livestock owners. Sweet PDZ is an all-natural, non-hazardous and non-toxic mineral. It captures, neutralizes and eliminates harmful levels of ammonia and odors. Sweet PDZ is a far superior alternative to lime products for ammonia removal and moisture absorption."
It comes in powder form and granules. For our purposes, we'd use granules. It dessicates the chicken poop and makes it easier to scoop, and anything that removes ammonia is a plus in the coop.
Folks have to evaluate their predator situation to know how to handle free-range vs keeping their chickens contained. Aerial predators like hawks absolutely can kill chickens, especially chickens as young as yours. Some snakes will eat chickens, especially young ones that are still small. It's hard for someone not in your area to given definitive advice on the predators you have to deal with specifically; but as young as your chickens are, they are at greater risk than full-grown birds. Identifying the predators you have there (what birds of prey, exactly which snakes, et al) and then spending some times reading through the predator threads might be helpful.