Steripen Classic (1st Generation)  Handheld UV Water Purifier Battery powered ultraviolet light water purifier Perfect for travel and outdoor use Purifies up to 150 liters on one set of AA batteries Purify a half liter in 48 seconds or liter in 90 seconds Easy operation activate, place lamp in water and stir, shuts off when finished Destroys over 99.9% of bacteria viruses and protozoa, like Giardia and Cryptosporidium Certified for purification by the Water Quality Association Fast safe effective and chemical-free Doesn't alter taste PH or other water properties Reusable to purify up to 8,000 liters Tapered end fits most commercial water bottles and canteens