Features: Say goodbye to dirty and unpleasant tasting water! Our easy to replace and easy to clean filters provide a reliable solution for maintaining the cleanliness and freshness of your pets water supply. They can filter hair and heavy metals, and improve the taste of water, so that pets can drink clean and fresh water all day, which helps to increase water consumption and reduce the risk of urinary tract infection. In order to prevent carbon dust (which will not harm your pet) from falling into the water, please soak the filter in water for 5 minutes and rinse it thoroughly with tap water before use. According to the pet's drinking frequency and the number of pets using the fountain, change the filter every 2-4 weeks. Measure your fountain before ordering and check whether the filter is suitable for your fountain. Suitable for pet owners, pet shop owners, and pet enthusiasts, our filters work with most popular pet water dispensers, offering convenience for many users. Specifications: Material: Cocoanut Active Charcoal Outter Diameter: Approx.127mm/5inch Inner Diameter: Approx.38mm/1.5inch Quantity: 1 or 6 or 8 or 12 Pcs Package Includes: 1 PC Filters or 6 PCS Filters or 8 PCS Filters or 12 PCS Filters note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.