Sawyer Products SP183 One Bag Water Filtration System, 4-Liter 0.1 Micron absolute hollow fiber membrane inline filter; includes one 4-liter reservoir Removes 99.99999% of all bacteria, such as salmonella, cholera, and E.coli; removes 99.9999% of all protozoa, such as giardia and cryptosporidium Housing material made from food grade ABS plastic is easily field maintainable Dispenses 4 liters of water in as little as 3 minutes; no residual chemical taste Backed by a manufacturer's limited lifetime warranty