AQUACREST Replacement cs-52 Refrigerator Water Filter, Compatible with 3M Cuno CS-52, CS-51 NSF 42 Certified Performance: Our superior water filter is certified by NSF International to NSF 42 for chlorine, taste and odor reduction. Youll enjoy freshly filtered ice and water every day. Top Quality Material: Our premium water filter uses high-grade natural coconut carbon block for quality filtration. Value for Money: Highly-efficient filtration for cents per gallon. You ll enjoy 1,500 gallons or 6 months of crisp tasting water at a fraction of the price. Dependable Service: We offer unconditional 30-day money back guarantee. Any issue, please feel free to let us know. AQUACREST cares you and your loved ones! Compatible Models: CS-52, CS-51, CS52, 00640565, B20CS5, B20CS8, 2168701, 5586605, SGF-BO52, OnePurify RFC1800A3PK filter cartridge & more. Advanced coconut carbon block for enhanced water purity. Easy setup wizard. Optimum results for up to 1,500 gallons or 6 months.