[Quadruple Filtration]: Quadruple filtration soften water quality, deep purification and enhance flavor, quadruple filtration system, 24-hour uninterrupted circulation filtration, intercept various impurities layer by layer, protect animal health< /p> It can filter cat hair, debris and coarse dust, heavy metals and other odors and impurities, providing only clean and healthy water. 【High compatibility 】: 12.5cm*12.5cm. 【Best Replacement】: Compared with ordinary activated carbon filter, our filter has longer service life and less frequent replacement. We recommend changing the filter every four weeks to keep the water clean. 【Easy to Use】: Please fully soak the fountain before use. Then plug the cat fountain filter into the water dispenser. Provide cats with fresh, healthy water. Instructions for use: In order to ensure a better filtering effect, the filter element should be replaced once a month. The filter element should be washed with water before use Product Description: Material: