Thanks for the info. I've linked to your website. I'm forwarding your e-mail to a short list of fluoride activists. We were discussing whether some of the systems that advertise fluoride removal, really work. I noticed your comments on the subject and thought that they should be shared.
RO units work on the same principle as our kidneys.
Think of a mesh, like the mosquito netting on your screen door. The mesh lets in air, but not mosquitos, because air molecules are smaller than mosquitos. So, an RO unit will not filter out F atoms as they are too similar in size to H2O molecules. Distillation units will also not work. Similar sized polar molecules have similar boiling and freezing points.