Quadruple Filtration Multiple filtered filter elements and pre-filter sponge can filter pollutants such as hair, dirt, heavy metal ions, remove chlorine and odor, provide dogs cats with better fresh water. /p> High-quality material: The cat fountain filter is made of high-density cotton fabric, coconut shell activated carbon and ion exchange resin. Comes with a pre-filter sponge that filters out pet hair and dust. Regular Replacement The pet water dispenser should be replaced with a carbon filter every 4 weeks. (In hot weather, bacteria are more likely to multiply. Please change the carbon filter every 2 weeks and the foam filter every 2 months to keep the water fresh. Tips: Replace the carbon filter every four weeks. Replace the sponge filter every two months. Soak the filter in a clean container for 5 minutes. always cares about the drinking water health of pets and helps them enjoy drinking water. Package Contents: Package includes 3.2L*8 stainless steel cat fountain and 8 round black foam filters. Note: Due to manual measurement, the size may have an error of 2 cm/1 inch; Due to different displays and angles, the color and size may be slightly different, thank you for your understanding welcomes your purchase We look forward to showing you your shopping experience. Note: The data are all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be some certain color difference, the actual object received shall prevail.