Emery Davis wrote in
:

I use a cheap cat litter made from sepiolite, which works really well.
I have run an experiment over several years and it doesn't seem to
break down at all.

Generally recommended is diatomaceous earth, I think you want to avoid
clumping litters like Fuller's earth.

Here's a link that discusses it in the bonsai context. I don't do
bonsai, and it works just as well.

http://www.bonsai4me.com/Basics/Basicscatlitter.htm


It sounds like a possible option. Thanks!

Al