SteriPEN harnesses the brilliant power of ultraviolet light to make water safe to drink. It’s the same technology used by leading bottled water manufacturers, as well as major cities in the U.S., Europe and Asia to purify water. Extensive testing has proven SteriPEN to be safe and effective, eliminating over 99.9% of bacteria, viruses and protozoa that cause water-borne illness. SteriPEN has earned the Water Quality Association’s Gold Seal, certifying its effectiveness.