Water purifier cartridge with a high-performance filter, set of 2, usable for approximately 3 months. - Brand: Cleansui - Model: MDC01SW - Quantity: Set of 2 - Filter Type: High-performance filter - Applicable Water Volume: 16L/day - Maximum Water Pressure: 100kPa - Usage Period: Approximately 3 months Although new, one of the two cartridges has been opened. I bought the wrong type for my water purifier at home, so I'd like someone who needs it to buy it. Thank you for looking.