Introducing the 4PK Replacement Charcoal Filters, Fits Drinkwell Stainless Multi-Pet & 360 Pet Fountains! Keep your pet's water tasting fresh and clean with these replacement filters. Made from premium activated carbon for maximum filtration, these easy to replace cartridges will keep your fountain running smoothly without any extra hassle. The charcoal filters are designed specifically for use with Drinkwell stainless multi-pet and 360 pet fountains to ensure a perfect fit every time. By changing out the filter regularly you can help reduce bad tastes and odors in your pet's drinking water while also removing large particles that may be present in tap water. Keep your four legged friends happy and hydrated with this convenient pack of replacement filters!