Replacement purifier cartridges for the UltraPress™ are designed to last 300 cycles (40 gal. / 150L). 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 Specifications: Active Technology : Electroadsorption and ultra-powdered activated carbon. Chemical-free : Yes Size : 2.9" (7.3 cm) H x 2.7" (6.7 cm) W Weight : 2.8 oz (80 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 : 10 seconds per 16.9 fl oz (3 liters/minute) Cartridge lifespan : rated for 300 cycles (40 gal. / 150L), 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