Platypus GravityWorks 4.0 Liter High-Capacity Water Filter System for Group Camping and Emergency Preparedness High-capacity, gravity-fed, hollow-fiber water filter system is ideal for group and family camping, outdoor adventures, and emergency preparedness Meets all EPA/NSF guidelines for removal of 99.9999% of bacteria and 99.9% of protozoa, including giardia, cryptosporidium, E. coli, salmonella, cholera No pumping required; reservoir fills easily and hangs from a tree to deliver four liters of filtered water for cooking and washing in 2.5 minutes Includes 4-liter dirty water reservoir, 4-liter clean water reservoir, hollow-fiber microfilter, hoses, shutoff clamp, and storage sack Replaceable cartridge filters up to 1,500 gallons; produces flow rate of 1.75 liters/minute; kit weights 11.5 ounces; made in the USA