Cat Water Fountain Filters for 84oz/2.5L Stainless Steel Pet Fountain and 67oz/2.0L Plastic Cat Drinking Fountain, 4 Pack Pet Replacement Filters Set - Wide Compatibility: Compatible with Stainless Steel84oz/2.5L Stainless Steel Pet Fountain and 67oz/2.0L Plastic Pet Fountain. - Triple Filtration System: Composed of a cotton layer, activated carbon and an ion exchange resin. Effectively to filter hair, heavy metals ,keeps water fresh and improve the taste of the water. - Keeping Health: Helps pet to increase water consumption. - Value Filter Set: Pack of 4 filters, each filter are individually packaged and sealed. - Note: Please rinse filter before use. Replace filter every 2-4 weeks.