SteriPEN harnesses the brilliant power of ultraviolet light to make water safe to drink. SteriPEN products are a great choice for campers, hikers, travelers or as part of your first aid and emergency preparation kits. 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. SteriPEN also offers different filter options for use in cases where removing debris or particulates are needed, so that you can get the most from your SteriPEN.