Used only twice for two cats. Includes 20 extra replacement filters, no box included. Prevents bad tastes and odors Filters out impurities in tap water Includes replaceable filter No-splash water slide Use for small dogs or cats Provides stream of naturally cool and oxygenated water Pet fountain for multiple-cat households or small dogs Capacity - 50 Ounces. Replaceable charcoal filter (change filter every 30 days to ensure freshness) The Aspen Pet Cool Flow Pet Fountain is an ultra-quiet purifying pet fountain that can be used for cats or small dogs. It features a replaceable filter and a reservoir that automatically adds water, providing naturally cool and oxygenated water. The continuous flow provides filtered water throughout the day to keep your cat or dog cool and hydrated. A patented unique no-splash slide will encourage your pet to come in for a drink. The fountain keeps pet dry even while he or she drinks, and it also allows the water to collect in the bowl. The fountain has a replaceable charcoal filter. Change the filter every 30 days to make sure the water is always fresh and to keep the fountain clean over time. The fountain is an ideal size that will fit nicely in your home. AC adapter plugs into a standard household outlet Reservoir automatically adds water as needed Aerates water while cooling it naturally Change filter every thirty days to ensure freshness Dimensions: 13.5” L x 9” W L x 7” H