https://blogs.mercola.com:443/sites/vitalvotes/archive/2005/01/26/Chlorine-Plants-Among-the-Largest-Sources-of-Mercury.aspxNine U.S. chlorine factories located primarily in the Midwest and Southeast have been identified as some of the largest and "long overlooked" sources of mercury, according to a report issued by Oceana, an environmental group. So much so, those nine plantsenCommunityServer 2008.5 SP1 (Debug Build: 31106.3070)