Steri Pen Classic with Prefilter

SteriPEN purifies water using Ultraviolet UV light. Whether your source is a clear running brook or a hotel tap, SteriPEN destroys viruses, bacteria and protozoa, including Giardia and Cryptosporidium in seconds. Theres no pumping, no chemicals, no filter clogging, and best of all, no after taste. The Classic with Pre Filter pack is all that is needed when camping, hiking, backpacking or traveling. Use the 40x40 micron screen Pre Filter to remove particulates from the water. The Pre Filter is designed to be stored directly on the wide mouth bottle.