Platypus GravityWorks 2.0 Liter Complete Water Filter Kit for Camping and Backpacking, Compatible with Hydration Bladders and Water Bottles Lightweight, gravity-fed, hollow-fiber water filter system adapts to hydration bladders and bottles from Nalgene, Klean Kanteen, Camelback, and more Versatile and adaptable for camping, backpacking, trekking, and survival; hang from a tree to filter water for 1-4 people for cooking and washing up Meets all EPA/NSF guidelines for removal of 99.9999% of bacteria and 99.9% of protozoa, including Giardia, Cryptosporidium, E. coli, Salmonella, Cholera Includes 2-liter dirty water reservoir, 2-liter Platy bottle, hollow-fiber filter, hoses, universal bottle adapter, push/pull cap adapter, storage bag Replaceable cartridge filters up to 1,500 gallons; produces flow rate of 1.5 liters/minute; complete kit weighs 10.9 ounces; made in the USA.Filter pore size (microns):0.2