Ensure your furry friend always has access to fresh, clean water with PawsPik Stainless Steel Battery-Operated Cat Water Fountain Replacement Filters. These high-quality filters are specifically designed for use with the PawsPik 3.2 L Oval Stainless Steel Water Fountain and the 4 L Circular Stainless Steel Water Fountain (sold separately). With these filters, you can rest assured that your furbaby is getting the cleanest water possible, free from impurities and harmful substances. To maintain the best quality water for your beloved buddy, it is recommended that you replace the filters every two to four weeks.