For best results, do not mix with non clumping cat litter. For first time use, start with an empty, clean cat litter box. Fill it with 3 to 4 inches of Fresh Step® Cat Litter. Remove clumps and solids

Fresh Step Clumping Cat Litter, Lightweight, Extreme, Long Lasting Odor Control Kitty Litter with Activated Charcoal, Low Dust Formula, 15.4 lb (Package May Vary)