The MSR Guardian Purifier Pump is a water purifier for clean drinking water in the backcountry, traveling and emergency kits. Think of it as your own personal kitchen faucet, if your water always went directly into a bottle or other handy container first. The Advanced Hollow Fiber filter provides a 2.5L per minute flow, so that delicious water will quickly be able to quench your parched mouth, minus those pesky virUses, bacteria, or other harmful gunk. The self-cleaning cartridge has a life of 10,000+ liters, grab your calendar and schedule in plenty of time for the backcountry. Features of the MSR Guardian Purifier Pump Stores easily Reliability on long trips Physically removes virUses, bacteria, protozoa, and silt in one easy step Treats up to 10,000 liters Built to withstand freezing temperatures as well as drops from up to 6 feet Revolutionary self-cleaning Performance means never back flushing again Ultimate Protection: Meets NSF protocol P248, testing standard used by U. S. military, for removal of virUses, bacteria, protozoa, and sediment from in.worst-casein. water conditions Fast and Easy: Pumps a rapid 2.5 liter per minute, offering added viral protection without the need for chemicals, bulbs, batteries, or waiting Extremely Durable: Engineered to withstand heavy use, freezing, drops, and harsh environments Nothing is safer or easier to use for purifying the most demanding backcountry water sources than the Guardian purifier Originally designed for military squads, it brings this Highly advanced Technology to global travelers, backcountry users, and those stocking emergency kits Fast and easy to use, this pump purifier offers the added viral protection you need when traveling in developing nations and popular wilderness Areas Its advanced hollow fiber filter offers the most reliable way to purify even filthy water conditions