[Compatibility and Service] Designed to fit perfectly with 101oz/3L crystal cat fountains in colors including Blue, Clear, Green, Grey, and Orange. [Advanced Triple Filtration] Our filters feature a sophisticated triple-layer system to the highest quality of water for your pets. The high-density cotton layer traps hair and debris, activated carbon removes odors and impurities, and ion exchange resin softens water by removing harmful metals. [Protective Pre-Filter Sponges] Each set includes high-density sponges that act as a pre-filter to capture hair and debris, protecting the pump and extending its lifespan. Regular replacement of these sponges ensures the fountain operates smoothly and efficiently. [Recommended Replacement Schedule] For optimal performance, we recommend replacing the filters and sponges every 2 to 4 weeks. If the fountain is used by multiple pets, consider more frequent replacements to maintain water freshness and hygiene. [Installation Reminder] To maximize the effectiveness of the filters, soak each filter in water for 2 minutes and rinse thoroughly under running water before installation. This simple preparation step ensures your pet enjoys clean, fresh away. Specifications:6Set Colour:As Shown Material:Non-woven fabric Package Contents: 6 * Cat Water Fountain Filters 6 * Sponges Foam Filters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.