Compatible: Compatible with 1.6 - 3L flower fountains. But not suitable for Catit fountain. Please measure the dimension of your fountain before purchase. Dimensions: outer diameter 125mm, inner diameter 35mm, thickness 10mm. Improve water quality: Three filtration methods can remove impurities. The outer polyester layer on each filter captures hair and debris. The three stages of filtration ensure water quality and improve the taste of fresh cat water. Easy to use: Rinse the filter with water before using, easy to mount on the fountain. Pack of 8 in a box: Economical Cat water fountain filters. We recommend replacing the filter every 2-4 weeks. Process 1, premium non-woven fabric and cotton mesh, it effectively removes hair, debris and impurities in the water , minimizes the threat of pests. Process 2, high quality premium activated carbon, it is made from natural coconut shell, removes residual chlorine and other infectious microorganisms. also removes odors, purifies drinking water and further improves taste, allows our pets to drink healthy water. Process 3, ion exchange resin, it removes ions heavy metals and softens the water, let our pets enjoy drinking water. The three filtration processes and high-quality materials of the cat fountain filter can improve the water quality and the taste of soft water. Compatible with most water fountains from 1.6L to 2.4L. NOTE: DOES NOT FIT CATIT FOUNTAIN. Size: outer diameter is 12.5cm/4.93 in internal diameter is: 3.5 cm/1.38 in Please check carefully whether the filter size matches your cat water fountain before purchasing. Individual PE bag for each filter, long storage time and more convenient. 8-piece replacement filters are more worthy of your possession. Tips: 1, rinse thoroughly the filter under running water before use. 2, Pet fountain filters should be changed every 2-4 weeks, depending on frequency of use. <p > Note: The data are all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending the physical object received Delivery Quantity: (according to the main image)