Perfect Match: Compatible with various pet water dispensers, from 1.6L, 2.0L, 2.4L to 2.5L, flower fountain and others of the same size. Size : 5" (diameter), 3.6" (inner diameter) Please check your water dispenser card slot size before purchasing. High quality material: Our cat filter uses natural non-woven fabrics, coconut shell activated carbon and resin ion exchanger. 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 fountain filter to cat 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 (Each fountain filter is individually wrapped, so you don't have to worry). Replacement filters are recommended every 2-4 weeks to keep the water clean.