My girls pecked at the PDZ at first but weren't interested in eating it after that. It won't hurt them, it's an all natural non-toxic product. Fine for the compost pile too. I think they have a powdered and granular form, I would recommend the granular just because of the dust from the powder.Thank you for all the lovely comments on our coop. My DH, the craftsman, built it so I cannot take any credit other than painting. We chose to use the poop board because I have a bad back. It is much easier for me to stand and scoop out a board then to stoop over and shovel or rake bedding. We currently have sand in ours, but I'm not loving the way it hardens into a crust and isn't easily siftable. I think I will slowly start to add PDZ until the sand is all gone. However, I'm a little worried about the chicks eating it. I have already noticed them picking around in the sand and eating bits of it . . .