MSR Guardian Gravity Cartridge Replacement Filter Cartridge

The MSR Guardian Gravity Cartridge is the high-performance replacement filter element for the MSR Guardian Gravity Purifier system, engineered to meet the rigorous NSF Protocol P248 military testing standard . This advanced two-stage purifier cartridge utilizes groundbreaking hollow-fiber technology with a 0.02-micron pore size to remove 99.99% of viruses, 99.9999% of bacteria, and 99.9% of protozoa, while also reducing sediment, microplastics, and particulate from even the most challenging "worst-case" water conditions worldwide . An integrated activated carbon core effectively reduces chemicals, unpleasant tastes, and odors, ensuring great-tasting water in the backcountry . The cartridge provides a rapid flow rate of up to 1 liter in 2 minutes (0.5 L/min) and has an exceptional service life of up to 3,000 liters (800 gallons), depending on water quality . Field maintenance is remarkably simple—opening the purge valve flushes the system to clean the filter and restore flow without backflushing, making it an ideal spare cartridge for extended expeditions where zero downtime is critical .

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