The 3 piece PETKIT Eversweet Carbon Replacement Filtration unit comes in a narrow rounded design and filters out and helps completely eliminate or screen any and all harmful chemicals and impurities found in contaminated or unfiltered water. Internally each filter features mesh screens with activated carbon and Ion-Exchange Resins. To only be used with the PETKIT Eversweet device. Includes 3 replacement filters. ITEM DIMENSIONS: Length 7.75 x Width 7.75 x Height 0.3