Guardian Water Purifier Pump by MSR

Ultimate Protection: for removal of Viruses, bacteria, protozoa, and sediment from “worst-case” water conditions
Fast & easy: pumps a Rapid 2.5 liters per minute, offering added viral Protection without the need for chemicals, bulbs, batteries, or waiting
Self-cleaning: pump self-cleans on every stroke, no back flushing or filter-scrubbing ever required
Long-lasting: leading-edge Hollow fiber cartridge treats up to 10,000+ liters
Extremely durable: engineered to withstand heavy use, freezing, drops (6ft to Concrete), and harsh environments