Replacement filters for cat fountains. Keep your cat’s drinking water fresh, clean and safe. This is how you take care of your cat’s health. Most filters on the market are made of activated carbon. But these filters are made of high quality Activated carbon, resin and nylon fabric. Deeper water purification is safer Special feature: Packaging and size: The packaging is worth 4 filters. Compatible with PingPin water dispenser. Dimensions: Diameter: 9.9cm/3.9in; Thickness: 8mm/0.31in. Double action filter: resin and activated carbon. Resin softens the water and reduces the likelihood of stones. Activated carbon can absorb impurities and odors, keeping the water fresh and clean. 3-Layer Filter: Improve water quality with 3 types of filters. The outer nylon layer on each filter catches hair and dirt. The three-stage filtration can ensure the water quality and improve the fresh water taste of cats. EASY TO USE: Rinse the filter thoroughly with water before use, easy to install on pet water