A while back we had a thread going about litters. Which one was best, etc. This is the link. It should give you lots of ideas. I am not sure what the disposal laws are in your area. Some towns allow litter in their green bins. Others don't. It's great you are so commited to this. It's one more plus for keeping Karlton inside.
http://www.pets.ca/forum/showthread....ghlight=zztopp