The cotton mesh layer catches bigger particles to prevent them from getting into the deep holes. Some of the key features of Tomcat Water Fountain Filter 1pc are: Filtered water is better for pet hydration. Water filters ensure better tasting and smelling drinking water. It helps keep pets from being exposed to contaminants bacterial toxins and even parasites. Filters out chemicals, metals and organic compounds that affect the taste and smell of water. Pakeway Tomcat Water Fountain Filter 1pc will serve as a standby spare part which will ensure continuous use of the Drinking fountain. Pakeway Tomcat Water Fountain Filter 1 pc is compatible with Tom Cat Pakeway Pet Drinking Fountain 2.5L (Aqua, Pink, White colours). Looking For some toys for your feline friend?