Pet fountain, 7.5 - 3.7 - 1.8 litres, stream/seaside Economical: Set of 4 replacement carbon filters Eliminates bad tastes and odors: the water is fresher for your pet thanks to the carbon Continuous cycle: slows bacterial growth between filters cleanings Extend the life of your fountain: It is recommended to replace the filter every 2-4 weeks. Dimensions (LxWxH): 5.08 x 6.1 x 3.6 cm Box contents: 4 spare filters