Replacement cartridge for the Katadyn Vario Microfilter. Replaceable filter element can last up to 500 gallons (depending on water conditions) before needing replacement. 0.3 micron high surface area; pleated glassfiber microfilter removes waterborne bacteria and cysts. Carbon core in replacement filter keeps water tasting fresh, and reduces chemicals, odors, and toxins through life of cartridge 604375149335 19768300012 290951