Item is new sealed unused in open box to insure quality. Whole House Water Filter System: 4.5 x 20 inch effortlessly fitting all standard whole home water filtering system housings. The 3 stage replacement set includes a Sediment Filter, Catalytic Carbon & KDF85 filter, and Carbon Block. Heavy Metal Filter: The large KDF85 filter, combined with catalytic carbon, is tested to efficiently remove iron, PFAS, sulfur, chloramine and more. Our unique KDF pad design guarantees smooth treatment for every drop. Block Particles and Purify: A 5 micron, multi-layer sediment filter blocks the harshest impurities. Outer layers trap large particles, while inner layers refine finer impurities. The NSF-certified carbon water filter efficiently removes chlorine, taste, and odors, ensuring sustained water purity. Replace Cartridges Every 6-12 Months: With a remarkable filter life of 100,000 gallons, relish the freedom of extended use and the ease of infrequent replacement. It’s filtration that effortlessly works for you. Health Safeguard, Equipment Protection: This big blue water filter set not only enhances water quality but also safeguards your health. It treats all home water, shielding appliances from potential harm. This protection prolongs lifespans, prevents scaling, clogs, and corrosion, optimizes performance, and reduces the risk.