Activated carbon traps and eliminates odors from urine and feces. The high-quality, clumping clay quickly locks in liquid and traps odors, forming ultra-tight clumps and preventing stinky crumbles after scooping, making cleaning fast and easy. The four compact, convenient, resealable packs make litter easy to carry, pour and store. To refresh and maintain your kitty litter box, every time you scoop just add more fresh step unscented cat litter.