Replacement filter for cat fountain. Keep your cat’s drinking water is fresh, clean, and safe. Helping you to take care of your cat’s health. Most of the filters in the market are made of activated carbon. But these filters are made of coconut shell activated carbon, ion exchange resin, high-density non-woven fabric. The water is deeply purified and safer. Features: Dual-action filters: Ion exchange resin can soften water and reduce the chance of lithiasis. Coconut shell-activated carbon can adsorb impurities and odor, keep the water fresh and clean. Non-woven fabric can filter out hair, sediment, and debris to clean water. Nano filter barrier small particles and other impurities. Compatible with: Compatible with Veken, automatic flower fountain and other of same size. Size: 4.9in(length), 1.38in(inner diameter), 0.31in(0.31in). Keep Pets Healthy: Filter material in bulk is more effective. Water quality can be removed by the 4 types of filtration. 4 steps of filtration can assure the