【For 84oz/2.5L】ONLY COMPATIBLE WITH 84oz/2.5L PET FOUNTAIN (Filter size: 4.8 x 4.8in). Not compatible with 95oz/2.8L pet fountain. Please check your original cat water filter model before purchase. 【Highly Effective Filter】Composed of high quality cotton layer, activated carbon and Ion Exchange Resin. High effectively to filter hair, heavy metals improve the taste of the water. 【Guarding Pet Health】 It is used with pet water fountain to increase the drinking water for pet and helps to reduce the risk of urinary tract infections. 【12 Pack Cat Water Fountain Filters】Including 12-pack of pet fountain replacement filters with separate plastic sealed package. 【Note】In order to prevent the dust on the filter surface falling into drinking water, please rinse filter with water before use. And replace filter every 2-4 weeks. Cat Water Fountain Replacement Filter, Dog Drinking Fountain Filter, Pet Water Dispenser Coconut Activated Carbon Ion Exchange Resin Filter for 84oz/2.5L Automatic Pet Fountain Waterfall (Pack of 12)