Perfect Match: Compatible with various pet water dispensers, 1.6L, 2.0L, 2.4L, 2.5L, flower-shaped fountains, and others of the same size. Dimensions: 13cm (diameter), 4.3cm (inner diameter). Please check the size of the water dispenser card slot before purchasing. High-quality material: Our cat filter uses natural non-woven fabrics, coconut shell activated carbon, and ion-exchange resin. Triple filtration: The outer cotton layer of each filter filters out large debris, hair, and dirt. Triple filtration can ensure water quality, remove residual chlorine and odors, and remove heavy metal ions, providing cats with better fresh water. Easy to use: Rinse the cat fountain filter before use to remove carbon dust. Then, place the raised side up and the flat side down for easy installation. You will receive: 10 cat fountain filters. It is recommended to replace the filters every 2-4 weeks to keep the water clean.