Actually, water is a chemical, Hydrogen Dioxide if I recall correctly from my high school chemistry class. Seriously, I agree, your liver or kidney has enough to do without having to deal with more toxins. I wonder if FDA approves of the chemicals used for water purification. I wrote Chlorx (sp?) once and they said only use it for emergencies, not for regular purification. Yet, if done properly it seems to me the Chlorine gas all gasses off and leaves nothing but water behind. (Any Chemists reading this? If so; Let me know if that is right).