I use Purina for indoor cats...the white bag. A cat at the kennel where I work used it, and I liked it. Keeps pee odor down.

Also check with your vet - I know a cat here didn't like the soft clay stuff (clumping weighs a ton and is a pain for me to look after) as she 'sank' in it(the cat psychic had found that out, and also that the kitty said she would try to use it - it worked!).

Just my experience.

Catty1