Simply pour 2 to 3 inches of World's Best Cat Litter into a clean, dry litter box. For the best results, do NOT mix with a non-clumping litter. After your cat has used the litter box, simply scoop the clump. For good hygiene, you should remove all clumps and solid waste daily. Maintain 2 to 3 inches of cat litter in the litter box at all time for long lasting odor control.