This MX1 faucet water purifier achieves approximately a 40% improvement in water purification capacity and can be used for about 12 months. I've already opened the bag, but it's new and unused. I bought the wrong size. I should have checked beforehand, but I realized it after opening the bag. - Model Name: MX1 - Usage Period: Approximately 12 months - Water Purification Capacity: Approximately 40% improvement Thank you for looking.