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 SPECS Active Technology: Ion exchange and ultra-powdered activated carbon Antimicrobial: Yes Chemical-free: Yes Size: 2.9" (7.3 cm) H x 3.1" (7.8 cm) W Weight: 3.8 oz (108 g) Removes: waterborne pathogens (99.99% of viruses, 99.9999% of bacteria, 99.9% of protozoan cysts), including Rotavirus, Hepatitis A, Norovirus, Giardiasis, Cryptosporidium, E. Coli, Cholera, Salmonella, Dysentery and more Filters: particulates (i.e. silt, microplastics, etc.); activated carbon effectively adsorbs chemicals, pesticides, heavy metals, flavors, and odors Fast Flow Rate: 8 seconds per 24oz (5 liters/minute) Cartridge lifespan: rated for 350 cycles (65 gal. / 250L), as "press time" reaches ~25 seconds (or three years have elapsed since first use) it&&';;s time to replace your purifier cartridge Cartridge shelf life: stored under proper conditions, an unused (and airtight) purifier cartridge has a shelf life of 10 years BPA-Free materials: made from ABS food-grade plastic and food-grade silicone Testing standards: independently tested by a certified laboratory to meet or exceed NSF/ANSI protocol 42 and 53 for pathogen and chemical removal; meets the the United States Environmental Protection Agency&';s Guide Standard and Protocol for testing microbiological water purifiers