Keep your kitties feeling fresh and friendly with the Feliway MultiCat Calming Diffuser Refill for Cats + World's Best Multi-Cat Unscented Clumping Corn Litter. When a cat has kittens, she releases natural, calming pheromones as her kittens start to nurse. This refill is designed to work with the Feliway MultiCat Diffuser (sold separately), and it’s a synthetic copy of that pheromone. By mimicking this bonding pheromone, Feliway creates a state of calmness and comfort to alleviate tension and conflict between multiple cats. Meanwhile, the powerful litter instantaneously traps odors and forms tight, easy-to-scoop clumps on contact. That means you can spare your home from that foul ammonia smell and clean-up becomes a breeze! A natural, compressed corn formula is completely free of silica dust, so you and your family can breathe easy. This 99% dust-free litter won't disturb your pouring with a dusty cloud! Plus, this formula is environmentally friendly—totally flushable, and safe for both septic and sewer systems.