BabyK, I don't like using perlite either. So, I have switched to crushed granite or chicken grit. It's usually found inexpensively at feed and seed stores here. Pumice, if found locally here, is a bit pricey. As for the kitty litter, which is usually calcined clay (make sure it's non-clumping), when used in potting media, is for moisture retention in a fast draining soil. It will help to keep the roots moist, but not wet, while still allowing the mix to drain quickly. Come to think of it, usually potting soil is not used when calcined clay is added to potting media, unless it's a chunky mix like orchid mix.
