Feliway Refill (48ml) A 48ml refill for the diffuser Feliway is a synthetic copy of the feline facial pheromone, used by cats to mark their territory as safe and secure. By mimicking the cats natural facial pheromones, Feliway creates a state of familiarity and security in the cat’s local environment. As a result, Feliway can be used to help comfort and reassure cats, while they cope with a challenging situation and/or help prevent or reduce stress. It is highly effective in preventing or stopping behavioural problems such as: Urine marking Scratching Problems associated with travelling and stays at the cattery. Diffuser lasts about 4 weeks.