Keep your kitty feeling calm and clean with Feliway MultiCat Calming Diffuser Refill for Cats, 1 count + Arm & Hammer Litter Clump & Seal Multi-Cat Scented Clumping Clay 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 cats. Meanwhile, the litter is specially formulated for seven days of odor protection for multi-cat households. A proprietary blend of moisture-activated micro-granules seals in odor, while Arm & Hammer baking soda destroys the odors on contact. Best of all, not only will your house stay smelling so fresh and so clean, but the ultra-low dust strong clumping formula makes clean-up especially easy.