[steffisn]

hi everyone, im not sure where to post this question, so if im posting in the wrong place, please move this thread.

i live in an city where the water is fluoridated and would like to filter it out. i heard that reverse osmosis filters remove fluoride and im considering buying one to put under my kitchen sink. but i came across a post on a different forum that claims the following:

"Sodium fluoride, sodium silicofluoride, fluorosilicic acid, hydrofluosilicic acid, ammonium fluosilicate are among the compounds used as fluoridating agents. All those substances become ionized in water, and so, they would pass right through the reverse osmosis filter. You can read that in any textbook on laboratory chemistry. Reverse osmosis is the passage of water under pressure through a semipermeable membrane made of cellulose acetate, aromatic polyamides, cellulose acetobutyrates or other materials. This treatment removes approximately 90 percent of DISSOLVED SOLIDS and 98 percent of ORGANIC impurities, INSOLUBLE matter and microbiological organisms. Reverse osmosis removes only about 10 percent of IONIC IMPURITIES impurities and does not remove DISSOLVED GASES. This method of water purification will produce type III water (the lowest laboratory grade) and is frequently used to treat water BEFORE its passage through ion-exchange resins to reduce the load on an expensive ion-exchange bed. In addition to claims that reverse-osmosis filters remove fluorides, some commercial enterprises sell water filtered using reverse osmosis, also with a claim that it removes fluorides. I guess the only reason they continue doing that is because so far nobody had sued them for misrepresentation."

unfortunately i dont have much knowledge of reverse osmosis and chemistry. can somebody here tell me if this makes sense? will a reverse osmosis filter remove agents used to fluoridate water?

thank you!

[Arkcon]

I think its unlikely that a household RO system will remove the trace of fluoride added to city water.  From Wikipedia (which in this case is written like a high school book report:) http://en.wikipedia.org/wiki/Reverse_osmosis_water_filter#Desalination  it is even possible to desalinate water via RO, which would probably work for your application.  But that seems to be on an industrial level only.