Description: Function:Foam Filter for Cat Water Fountain Help keep the pump cleaner in between cleanings, Maintain the fountain flow rate, Keeps water drink fresh.Material: Our pet water fountain filter is made of high density sponge foam, providing great filtration for your pet's drinking water. Universal Compatibility: These replaceable cat water fountain filter are versatile and fit for various types of pet fountain. Replaceable: The foam filter of the pet drinking fountain can be easily removed for pump cleaning and foam filter replacement. It is recommended to replace the foam filter every 2-4 weeks to keep your pet clean.Package Details: Each package includes 15 pieces of cat fountain sponge filter, ensuring you have enough replacements on hand to keep your pet's water freshness and clean. Size Chart: 6.5cmx3cmx3cm/2.56inchx1.18inchx1.18inch Package Includes: 15 cat fountain sponge filter Note: Please allow slightly errors 1-2cm differences due to manual measurement.