Thanks for all the help. I will not be using cat litter in my coop. I think I'll try the Sweet PDZ.
My chickens are free range during the day, but I lock them up at night to keep them safe from predators. Their house is an old shed my husband converted to a hen house for me. It's probably 10' x 12', with a wooden floor,and we took the door off so they go out in their 10' x 10' run with dirt floor. It's completely fenced with chicken wire. It is very humid where I live, and sometimes I don't get to let them out till 9:00 a.m. So when I get there, the poop is very fresh! But I try to scoop it out every day, and every few months I take out all the bedding and replace it. Any more suggestions?