Drinkwell 360 Pet Water Fountain Filters The Drinkwell 360 Replacement Filters keep water clean & fresh and are designed to fit only the Drinkwell 360 Fountains. The cylindrical filter features a pull-tab for easy placement and removal. The filter contains granulated carbon for extended filtration and the duo density polyester pad captures debris. Filters should be replaced every 2 weeks. Features: Keeps Water Clean and Fresh Pull Tab for Easy Replacement and Removal Contains Granulated carbon for extended filtration Item Specifications: Size: 3 Pack PAC00-13712 729849137127