Restore flow rates in your AutoFlow Gravity Filter by replacing a tired, worn cartridge with fresh, new Hollow Fiber media. Specs Weight (Standard): 2 oz Width (Standard): 2 in Length (Standard): 6 in Height (Standard): 2 in Effective against bacteria: Yes Effective against chemicals/toxins: No Effective against particulate: Yes Effective against protozoa: Yes Effective against viruses: No Filter media: Hollow Fiber Filter pore size (microns): 0.2 Flow (L/min): 1.75 liters per min Cartridge life: 1500 liters Field cleanable: Yes Field maintainable: Yes Cartridge replacement indicator: Yes Material(s): Hollow Fiber Country of Origin: Made in the U.S.A. of U.S. and Imported Materials