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. *Original receipt/ UPC required, submit refund request within 60 days of purchase. For full terms/instructions, go to Fresh Step's website. **Among Fresh Step clumping litters. ***Vs. Fresh Step Multi-Cat. ****Based on number of days claimed by leading regular clumping litter. FEBREZE is used under license from The Procter & Gamble Company or its affiliates.