Compatibility - This cat water fountain filter replacement and water pump filter are compatible with the WF20/CF20 wireless pet water fountain. The size matches the original filter exactly. This pet water fountain filter provides a reliable solution for maintaining clean drinking water for your pets. Triple Filtration System - This cat water fountain filter features a triple filtration system that includes non-woven fabric, activated carbon, and ion exchange resin. It helps remove odors, soften water, and improve the taste and quality of your pet's drinking water. The pre-filter sponge captures pet hair, dirt, and food particles, ensuring your pet receives pure and healthy water. Water Pump Filter - This cat water filter includes 9 high-density sponge filters designed to trap debris and hair in the water. They help prevent clogging and protect the pump, extending the lifespan of the fountain’s pump. Instructions for Use - To maintain fresh and hygienic drinking water, replace the pet water fountain filters every 2 to 4 weeks depending on the number of pets. Before installation, soak the filter elements in water and rinse for 2 minutes to ensure optimal filtration performance. The filter uses activated coconut carbon, a safe and natural material that effectively reduces heavy metals and residual chlorine from water. Material: Non-woven fabric Color: White + Black Package Contents: 9 x Filter Elements 9 x Filter Cotton Note: Light reflection and differences in display screens may cause slight variations in color between the product image and the actual item. Measurement may vary by up to 1-3 cm.