Tackle tough odors for 30 days guaranteed with Fresh Step’s longest odor fighting formula. Fresh Step Heavy Duty Clumping Litter features 3X odor eliminating carbon for active odor control. With Febreze freshness, it helps make sure your litter box environment stays fresh and inviting. Whether you have one cat or a clowder, this litter’s active odor control fights odor 3X as long as the leading brand to help keep your feline friends happy and your nose even happier.