Features: Cat fountain filters + sponge set to meet the needs of your replacement. 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 addition, pre-filtering sponges are added around pump to better filter impurities and extend the service life of pump. 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. Specifications: Material: Nonwoven Fabric Size: As Shown Quantity: 4 Pcs Or 8 Pcs Package Includes: 4 PCS Filters 4 PCS Sponges or 8 PCS Filters 8 PCS Sponges 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.