Nanovet Cat Litter Odour Additive are made from America’s purest Zeolite. They eliminate the tough cat odors (urine, feces, hairballs and vomit) in the litter box, and from indoor and outdoor surfaces – including all carpet, flooring, bedding, furniture and upholstery. They don’t cover up odors. Instead, the dry granules work like powerful odor magnets to attract, absorb and lock away liquids and gases that cause odors.