I agree, turface is a superior product, but cat litter isnt a bad idea. You have to use the right type/brand but there are some good ones out there. Obviously clumping kindas are bad. We have a thread about this going at BonsaiSite. Theres even pictures of the litter and bag in the thread. And the guy who is using cat litter, isnt some noob without a clue. Anyways Check it out.
http://bonsaisite.com/forums/index....t=ST&f=5&t=1800