【Fits Well & Easy to Clean-】This cat water fountain filter perfectly compatible with the cat water fountains 2L,2.5L (67oz,84oz）showed in the image. (Filter size: 10cm/3.9", Center hole size: 2cm /0.79"). Please make sure these cat fountain filter replacement is compatible with your cat fountain before purchase.【No Plastic & Biodegrade Better】Our cat fountain filters are composed of a layer of high qunlitty cotton,activated carbon and ion exchange resin. Cotton layer replace the plastic framing, biodegrade better after it is discarded. Can do a better good job of filtering the water as well as any soggy pet food that may make it into the pet fountain.【Keep Your Pet Healthy】-There are certain chemicals in the water that affect pets health, this pet water fountain filter can help to remove junk from water and provide clean and fresh water for your pet, reduce the risk of urinary tract infection; it is very important for the health of pets.【 Individual Packaged Cat Fountain Filters】-Each cat fountain filter replacement is individually packaged, this can ensure the tightness of each cat water fountain filter and maintain high quality.【Suggestions】-Soak the cat filters for about 1 minutes before use. To maintain the filtering effec,recommended to replace the cat fountain filters every 2-4 weeks,depending on the level of use and the number of pets drinking from the cat water fountain.