Official Cat Water Fountain Filters Replacement & Pre-Filter Sponges for 3.2L/108oz Automatic Pet Fountain Dog Water FountainWide CompatibilityCat water fountain filter (square) is designed compatible with Rellaty's 108oz 3. 2L Pet Water Fountain and other fountains with same volume and style. Package includes 4 pack of pet fountain replacement filters. They are individually packaged and sealed to maintain high quality. Triple Filtration SystemCat fountain filter is composed of activated carbon, ion resin and non woven fabric. They can filter hair, heavy metals, dirt and