Feliway Classic 30-Day Refill for Diffuser (3 Pack)Use FELIWAY Classic Refill every month to continue to help your cat feel comforted at home and reduce signs of stress such as peeing, scratching or hiding. Scientifically proven and recommended by veterinarians. 1 refill provides 4 weeks constant support. Details When to use? To continuously soothe your cat at home. If your cat shows signs like spraying, scratching walls or furniture (in multiple locations) If your cat shows signs of stress such as