What are the pros and cons of using kitty litter as a substrate for a planted tank? (natural, best)

[mithch]

What are the pros and cons of using kitty litter as a substrate for a planted tank? Or, would I be better off using the classic eco-complete, etc. pre-made substrates for aquaria? Also, has anyone used the Walstad natural method? I have found a page [url=http://thebestkittylitter.com/what-is-kitty-litter/]What is kitty litter? « The Best Kitty Litter[/url] but looking for more info.

[karen_in_nh_2012]

Any clumping litter will clump when moisture hits it so it doesn't seem like a good choice for an aquarium!

Also, not sure why this is in CATS if you're asking about FISH? Maybe a moderator can move it?