Steripen Adventurer Opti Ultraviolet Water Uv Purifier

Backpacker Editor's Choice 2011.  Germicidal UV light destroys viruses, bacteria and protozoa. 8,000 treatments.  Purifies 0.5 L (16 oz) of water in 48 seconds or 1 L (32 oz) in 90 seconds.  Pocket size rugged purifier weighs only 3.6 oz with 2 CR123 batteries (included!).  Optical water sensor also serves as integrated LED flashlight.   Water Filters & Purifiers CW Dwell Time 90 Seconds Effective Against Bacteria   Protozoa   Viruses Filter/Purification Type Ultraviolet Other features Flashlight Output .79 Quarts/Use (.75 L) Treatment Capacity 10.5-13 Gallons/Charge (40-50 L) Weight 103.0 grams (3.6 oz.)