Sounded like an advertisement for PDZ, huh...
http://www.sweetpdz.com/
I use it for my pet hamsters house. It really works. They sell it at the feed store 3 miles from my house. So, I read up on it a bit to see if they are reptile friendly and it looks like it is. So, I started using it in my feeder rat colony as well. It was $16 for a 25 lb bag that looks like it's going to last me 2 years! I only sprinkle a little amount before I put the substrate during cleaning day (which for my hamsters is weekly but for my ASF rats could go longer).