MSR Guardian Pump Replacement Cartridge Red. Removes viruses bacteria protozoa and particulates like dirt and sediment. Specifications for MSR Guardian Pump Replacement Cartridge: Manufacturer: MSR Color: Red Application: Camping Pore Size: 0.02 microns Height: 2.75 in Age Group: Adults Fabric/Material: Hollow Fiber Seasonal/Temperature Use: All Seasons Weight: 6 oz Cartridge Life: 10000 liters Field Maintainable: Yes Flow Rate: 2.5 liters per minute Width: 2.75 in Length: 5.75 in Features of MSR Guardian Pump Replacement Cartridge: Comes with clean-side cover. Package Contents: MSR Guardian Pump Replacement Cartridge MSR 2407: Guardian Pump Replacement Cartridge Red