Ensure your furry friend always has access to clean, fresh water with Casfuy Cat Water Fountain Replacement Carbon Filters & Sponges. These replacement parts are designed to fit perfectly in the Casfuy Quiet Stainless Steel Dog & Cat Water Fountain with Dual Water Flow Mode and Casfuy T-Faucet Stainless Steel Dog & Cat Water Fountain (each sold separately). The triple filtration system includes an activated carbon filter and pre-filter sponge that work together to remove debris, hair, and particles, soften the water, and eliminate any unpleasant tastes or reduces odors. Each set includes carbon filters and pre-filter sponges that are individually sealed for freshness and easy replacement. For best results, make sure to soak and rinse the filters before use, clean the fountain and filters with each water change, and replace them every two to four weeks to maintain water quality and keep your pet healthy. Made with safe, pet-friendly materials, these filters keep water fresh to help encourage your pet to stay hydrated.