Using Naturally Fresh Quick - Clumping Cat Litter is easy. First, fill the litter box with the cat litter. You can choose either the 14 - lb or 26 - lb size according to your needs. When your cat uses the litter box, the litter will form tight clumps in about 15 minutes. Just scoop out the clumps regularly to keep the litter box clean. Thanks to its great odor - absorbing ability, you won't have to refill the litter box as often as with clay litters. Note that although it's made of walnut shells and doesn't stick to the box, you still need to clean the litter box thoroughly from time to time to maintain a hygienic environment for your cat. And make sure to keep the litter in a dry place to maintain its absorbency.