product description:You thirst for adventure. Quench it safely with the O-Pen. Whether your adventures bring you to a quaint sidewalk restaurant in a foreign land, or you just want to drink from that cold mountain stream, you can rely on the Roving Blue O-Pen to ensure that the water is safer to drink. The O-Pen is the latest advancement in pocket water purifiers. It makes water safer by infusing it with a cloud of ozone gas. Used by water treatment plants and water bottlers world-wide, ozone is the strongest oxidizer available that can be safely used in water treatment 1 In 1997, the FDA approved the use of ozone as an anti-microbial agent with indirect contact with foods. In 2002, the FDA approved ozone for use on food contact areas and directly on food with its “Generally Regarded as Safe” (GRAS) designation. Today, the Organic Foods Production Act (OFPA) identifies aqueous ozone (ozone dissolved in water) as a substance that is allowed for use in organic crop and livestock production. The Roving Blue O-Pen utilizes "The Power of EO3", electrolytic ozone, more powerful than chlorine, and is highly effective against multiple dangerous organisms, bacteria, viruses and cysts: Partial List of Micro-organisms that Ozone Can Destroy: Bacillus anthracis (Anthrax) Cholera Cryptosporidium Giardia Influenza Poliovirus (Poliomyelitis) Salmonella paratyphi (Enteric Fever) Streptococcus faecalis Bacteriophage (E. Coli) Dysentery bacilli (Diarrhea) Hepatitis Legionella pneumophilia (Legionnaires’ Disease) Salmonella (food poisoning) Salmonella typhosa (Typhoid Fever) Tuberculosis Additionally, there is no chance these organisms can develop a resistance to ozone. Best of all, when its job is done, ozone reverts to oxygen quickly, leaving no chemical residue, odors or tastes.