Keep your pet's water fresh and clean with the PetSafe Foam Filters for Pet Fountains. These filters are designed to work with the Viva Pet Fountain to remove debris and hair from your pet's drinking water. The foam filters catch larger debris, protecting the fountain's pump and prolonging its life. By helping prevent clogs and extending the life of your fountain, these filters provide added value and convenience. The foam filters are easy to install and should be replaced every 1-2 months for optimal performance. Each kit includes 2 foam filters. Your pet deserves the best. Trust PetSafe to keep your pet healthy, hydrated and happy.