The MSR Guardian Military-Grade Water Purifier Filter Cartridge Replacement restores the MSR Guardian Purifier’s flow rate to 2.5 liters per minute (assuming there arent any other factors inhibiting flow), and lasts up to 10,000+ liters. Removes viruses, bacteria, protozoa, and particulates, like dirt and sediment. Manufacturer’s limited 3-year warranty. Made In USA.