Portland area cities were actually some of the first major metropolitan cities to pass the torch on fluoridation. Interesting they're so well-known for being activists; I can't imagine what would happen if they were actually fed correct information. I have a guy in a fireworks club from the water department down there, he specializes in compounds for color effects etc. He's been there over 30 years & even he's brainwashed. As far as Big Berkey/minerals, as long as you don't microwave it, there is a list on the compounds/ionized particles etc. that get's filtered by each filter. A cool item they have is a travel Berkey, which I'm taking with me to Israel next month.