KEEP YOUR PETS HEALTHY: Water quality can be improved with all three types of filtration. Replacement carbon filters capture hair and debris, remove impurities and odors, keep water fresh and take care of your beloved pets. HIGH QUALITY MATERIAL: Replacement filters are made of high quality activated carbon and long-exchange resin material, great for your pets. Always keep the water fresh, encourage pets to drink more. DURABLE FOR LONGER USE TIME: Replace the filter every 2-4 weeks to keep the water fresh, 4-8 packs of carbon filters can be used for 8 months, encourage your cat and dog to drink more to stay healthy. EASY TO USE: Easy to install, convenient to use and clean. English: Note: Rinse the filter thoroughly with water before use. Note: It is only suitable for 2.5L square fountains! YOU WILL GET: 8 pack of high quality activated carbon filters, if you have any problem, please feel free to contact us, we will try our best to solve it. Replacement Carbon Filter, Automatic Pet