We use Feline Pine which breaks down into a sort of sawdust after the pee in it. The bag says after you clean out the poo, you can "scoop, flush, and use as mulch." We've got five adult cats with four boxes and only have change them once per week with this product; we also don't have to use as much as traditional litter and the cats like it!

Rog was wondering why the poo couldn't be used; then, wondered what would grow best with it as a fertiliser...we all agreed it'd have to be...catnip!**bg**