Replacement filter for cat fountain. Keep your cat’s water fresh, clean and healthy. Help you take care of your cat’s health. Most filters on the market are made of activated carbon. But these filters are made from high quality activated carbon, resin and cotton. Water is deeply purified and safer. Features: Value pack of 12 filters. Compatible with YOUTHINK, HOMMI, ISYOUNG , KOALAD, HAPPYPAPA, PEDY, DADYPET, automatic flower fountain and others with the same size. Size: 5 inches (external diameter), 1.5 inches (internal diameter). Dual action filters: resin and activated carbon. The resin can soften the water and reduce the risk of lithiasis. Activated carbon can absorb impurities and odors, keep water soft and clean. PP cotton can filter hair, sediment and debris to clean water. Water quality can be removed by the three 3 types of filtration. The outer cotton layer on each filter captures hair and debris. Three stages of filtration can ensure water quality and improve the taste of