Replacement filter for cat fountain. Keeps your cat's drinking water fresh, clean, and safe, helping support your cat's health. Most filters on the market are made of activated carbon, but these filters are constructed with high-quality activated carbon resin and cotton mesh for deeper water purification and improved safety. Features: - Value pack of 12 filters - Compatible with YOUTHINK, HOMMI, ISYOUNG, KOALAD, HAPPYPAPA, PEDY, and other fountains of the same size - Size: 5 inches (outer diameter), 1.5 inches (inner diameter) - Dual-action filtration: Resin and activated carbon. The resin helps soften water and may reduce the risk of urinary issues. Activated carbon absorbs impurities and odors to keep water fresh and clean - PP cotton layer filters out hair, sediment, and debris for cleaner water - Three-stage filtration system effectively improves water quality and enhances the taste of fresh water for cats - External cotton layer captures hair and debris - Rinse the filter thoroughly before use; easy to install in pet water fountain - For optimal performance and water hygiene, replace the filter every 2 to 4 weeks Specifications: - Name: Cat Water Fountain Filter - Inner material: Activated carbon resin - Size: Outer diameter: 127mm / 5in, Inner diameter: 38mm / 1.5in, Thickness: 8mm / 0.31in Package Information: - Package size: 14 x 14 x 11.5cm / 5.5 x 5.5 x 4.52in - Package weight: 205g - Gift box packaging Package List: - 12 x Cat Water Fountain Filter