If you want clumping litter my recommendation to you would be either Swheat Scoop or World's Best. These are natural, green cat litters. You can also flush them down the toilet which makes scooping litter simple if your pan is located in the bathroom. Swheat Scoop smells just like bread when your cats pee, since it's made out of wheat. Feline Pine also makes a scoopable formula as well which works very nice. All of these are a lot better on our environment than other litters as they are naturally biodegradable and don't harm our environment. They also form very solid waste nuggets that are easily scooped out of the box. They don't crumble etc.