1、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. Cotton can filter out hair, sediment and debris to clean water. 2、Compatibility: Suitable for all round filter space, matching the size of the water dispenser. Filter size: 5.2in(outer diameter), 1in(inner diameter). 3、Keep Pets Healthy: Filter material in bulk is more effective. Water quality can be removed by the 3 types of filtration. 3 steps of filtration can assure the quality of the water and enhance the taste of freshwater for your cats, so as to protect your pet\u0027s health. 4、How to Use: Rinse the filter with water thoroughly before using it, easy to mount it on the pet water fountain. In order to ensure the water clean, the filter should be replaced in time, please replace them every 2-4 weeks. 5、Warranty: Any problem, please contact our store without hesitation. Honor to serve you! 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, cotton. 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. Cotton can filter out hair, sediment and debris to clean water. Compatibility: Suitable for all round filter space, matching the size of the water dispenser. Filter size: 5.2in(outer diameter), 1in(inner diameter). Keep Pets Healthy: Filter material in bulk is more effective. Water quality can be removed by the 3 types of filtration. 3 steps of filtration can assure the quality of the water and enhance the taste of freshwater for your cats, so as to protect your pet's health. How to Use: Rinse the filter with water thoroughly before using it, easy to mount it on the pet water fountain. In order to ensure the water clean, the filter should be replaced in time, please replace them every 2-4 weeks. Warranty: Any problem, please contact our store without hesitation. Honor to serve you! Specification: Name: Cat water Fountain Filter Main Material: Coconut Shell Activated Carbon, Ion Exchange Resin, Cotton Size: Outside Diameter: 13.2cm/5.2in, Inner Diameter: 2.5cm/1in, Thickness: 1cm/0.39in Optional Types: 4 Pack; 6 Pack; 8 Pack, 12 Pack, 16 Pack Package Information: Package Size: 4Pack: 13*13*3.8cm; 6Pack: 13*13*5.6cm; 8Pack: 13*13*8cm; 12Pack: 13*13*12cm; 16Pack: 13*13*16cm Package Weight: 4Pack: 106g; 6Pack: 150g; 8Pack: 195g; 12Pack: 288g; 16Pack: 380g Gift Box Packaging Packing List: 16* Cat Water Fountain Filter 16* Cat Water Fountain Filter