I'm a financial guy and admittedly horrible in all things science. The manufacturer says the ozone level is reduced to 0.00 ppm at the completion of a 2 hour period in which the ozone is either dissipated into the atmosphere or converted into O2 (can't remember which). When I apply the mask, it still smells like a pool....residual ozone?? The manufacturer says it's normal. Am I slowly killing myself by breathing it for 6 hours each night? If it's made in China, I guess that answer is 'yes'. There's plenty of info on Al Gore's amazing internet, but I think I'd rather trust a lizard. Uh-oh. Anyone else here use a Soclean?