Replacement purifier cartridges for the GeoPress are designed to last350 cycles (65 gal. / 250L). Lifespan will decline when purifying waterwith high levels of silt, sediment or tannins. Cartridge press timeincreases towards the end of the cartridge lifespan; when press timereaches 25-30 seconds, the cartridge should be replaced. Cartridgecontinues to protect, even as press time increases.
