Keep your cats calm and contented when you refill your Feliway diffuser. The 48ml Feliway Refill Vial contains natural pheromones that are unnoticeable to humans, but are effective in soothing anxious, shy and timid cats. Reduce unwanted behaviours such as scratching and toileting in unsuitable places by making sure that your diffuser is topped up. Each refill vial lasts for 30 days.