Please follow the links below to read about how harmful traditional clay litter can be to you and your animals. 

http://www.moderncat.net/2011/03/06/reminder-why-clay-cat-litter-is-evil/

http://catmom.com/articles/clump.html

http://www.naturalnews.com/041255_kitty_litter_bentonite_clay_harmful_ingredients.html