Brand new, unused item! Replacement目安: Families of 5 or more: approximately 2 months (20L per day), families of 3-4: approximately 3 months (13L per day), families of 1-2: approximately 4 months (10L per day). Antibacterial ceramic filter using 97% natural materials. The filter has antibacterial properties, making it difficult for bacteria to breed inside the cartridge, providing safe and clean purified water at all times. High-performance activated carbon is used to achieve compactness. Filter materials: Ceramic (raw materials/calcium aluminosilicate and diatomaceous earth, 2-layer structure), activated carbon (activated carbon fiber), non-woven fabric. This cartridge is easy to handle with the faucet body and easy to replace, and it doesn't take up much storage space, making it a user-friendly cartridge. Z_0349