MSR Guardian Purifier

• Unlike conventional hollow-fiber technology, the advanced medical-grade fibers in the Guardian block viruses'something most other hollow-fiber filters cannot do
• Physically removes viruses, bacteria, protozoa and particulate, including hepatitis A, E. coli, giardia, cryptosporidia and more
• Purifies 2.5 liters per min.
• With every stroke, the purifier uses 10% of its water to flush the contaminants in its filter back into the source; this means you'll never have to hassle with back-flushing
• Rugged construction is designed to withstand freezing and drops up to 6 ft.
• Cartridge life: 10,000 liters

Made in USA.