Pretty litter explains that their cat litter is clump-free. They use a lightweight and super absorbent silica gel in the litter. By using silica gel crystals, there are lot more absorption capabilities in this cat litter than other options on the market. This means that you'll have to have a lot less cat litter to use with other brands.  With the traditional calendar that you can buy at the grocery store, it clumps the litter in two large. This means that all will leave you with large and heavy clumps for you to scoop out of the box. By using PrettyLitter, you don't have to worry about finding these large clumps in the litter box. The only thing that you'll have to worry about is keeping out of the cat box and getting rid of your cat's poop. This is what law allows you to have a bag that lasts you an entire month.