Grayl GeoPress Replacement Purifier Black Cartridge - Replacement purifier cartridges for the GEOPRESS are designed to last 350 cycles (65 gal. / 250L). Lifespan will decline when purifying water with high levels of silt, sediment or tannins. Cartridge press time increases towards the end of the cartridge lifespan; when press time reaches 25-30 seconds, the cartridge should be replaced. Cartridge continues to protect, even as press time increases. Features Removes waterborne pathogens (viruses, bacteria, protozoan cysts), including Rotavirus, Hepatitis A, Norovirus, Giardiasis, Cryptosporidium, E. Coli, Cholera, Salmonella, Dysentery and more Filters: particulates (sediment, microplastics) and many chemicals, pesticides, and heavy metals Improves taste, smell and clarity Size: 2.9in H x 3.1in W Weight: 3.8 oz