Reverse osmosis is the most sure fire way. I bought a fluoride testing kit and test all kinds of stuff. My reverse osmosis filter gets it all out. Then if I make black tea with it, it is higher than my crappy, plain tap water. I didn't believe that tea had it until I tested it myself.

Reverse osmosis is the most sure fire way. I bought a fluoride testing kit and test all kinds of stuff. My reverse osmosis filter gets it all out. Then if I make black tea with it, it is higher than my crapoy, plain tap water. I didn't believe that tea had it until I tested it myself.