Sincereetali Cat Fountain Replacement Filter. Keep your cat's water fresh, clean, and safe. It helps you take care of their health. Most filters on the market are made of activated carbon. But these filters are made of high-quality activated carbon, resin, and cotton mesh, which deeply purifies the water and makes it safer. Features: Value pack of 4 filters. Compatible with Veken, automatic flower fountains, and others of the same size. Size: 4.9 inches (length), 1.38 inches (inner diameter). Dual-action filters: resin and activated carbon. Resin can soften the water and reduce the risk of stone disease. Activated carbon can absorb impurities and odors, keeping the water fresh and clean. Water quality can be eliminated by the three 3 types of filtration. The outer layer of cotton on each filter captures hair and debris. Three stages of filtration can ensure water quality and improve the taste of fresh water for your cats. Rinse the filter thoroughly with water before use, easy to mount on a pet fountain.