I am selling this item because I no longer need it due to a move. I purchased it directly from the management company of my apartment building this May. It is new and unopened. To prevent water damage, I will ship it in a Ziploc bag. This cartridge has a water purification capacity of 350 liters and can be replaced every 3 months. - Model Name: M71750M-1 - Compatible Products: Water purifier cartridge - Filtration Capacity: 350 liters - Operating Water Pressure: 0.05MPa - Replacement Period: 3 months - Country of Manufacture: Japan Thank you for looking.