I use Feline Pine and SWEAR by it! I've got a total of 7 cats in my house right now (6 of which are mine). You only use and inch in the box. Everyday you remove the solid waste. The urine is absorbed by the pine pellets. Once it turns completely into sawdust, you dump it and start over again.

I've used all sorts of cat litters over the years. This is the only stuff I've stuck to.

I love the stuff!!