Spare filter for cat fountain. Keep drinking water from your fresh, clean and safe cat. & nbsp; allowing you to take care of your cat’s health. & nbsp; & nbsp; active coal. But these filters are made of high quality Active coal resin and cotton net. & nbsp; Water is deeply purified and safer. : & nbsp; 12 filters pack. Compatible with Youthink Hommi Isyoung Koalad Happypapa Pedy and & Nbsp; & nbsp; of the same size. Size: 12.7 cm (outside diameter) 3.8 cm (inner diameter). Double action filters: resin and active coal. Resin can soften water and reduce the risk of lithiasis. & Nbsp; & nbsp; can Adsorbe impurities and smells to keep the water cool and clean. PP cotton can filter hair sediment and debris to clean water. & nbsp; quality can be deleted by the three 3 types of filtration. The external cotton layer on each filter captures hair and debris. & Nbsp; & nbsp; the filtration steps can ensure the quality of the water and enhance the taste of fresh water for your cats. Rinse The