MSR Guardian Gravity Purifier Replacement Cartridge

CampSaver.com says:
MSR Guardian Gravity Replacement Cartridge Grey. Specifications for MSR Guardian Gravity Replacement Cartridge: Manufacturer: MSR Color: Grey Age Group: Adults Features of MSR Guardian Gravity Replacement Cartridge Ultimate Viral Protection: Meets NSF protocol P248 military testing standard for removing viruses (99.99percent) bacteria (99.9999percent) protozoa (99.9percent) sediment and microplastics from 'worst-case' water conditions High-Flow: Groundbreaking hollow fiber technology for fast anti-virus water purification (up to 1L in 2 minutes) Better-Tasting Water: Two-stage purifier includes activated carbon to reduce chemicals and unpleasant tastes and odors Package Contents: MSR Guardian Gravity Replacement Cartridge MSR 13469: Guardian Gravity Replacement Cartridge Grey