Fluorine should not be confused with  fluoride, although in the early fluoridation literature the words were  used interchangeably. Fluorine is an element. Fluoride denotes that  fluorine has combined with other elements and formed a compound, e.g.  hydrofluosilicic acid (H2SiF6) sodium silicofluoride (NaSiF6) sodium  fluoride (NaF) and calcium fluoride (CaF2).
  
Hydrofluorosilicic acid (H2SiF6) is one of the most commonly chosen chemical used to fluoridate public water supplies. 
  
Some  of the contaminants reported as present in fluorine bearing substances  hydrofluosilicic acid and other silicofluorides used in fluoridation  programs include arsenic, barium, beryllium, cadmium,  chromium, crystalline silica, fluorine, hydrogen fluoride, iron, iodine,  lead, lead 210, mercury, phosphorous, polonium 210, radon 222,  selenium, silica and silver. Some specific agents used or present in  phosphate/hydrofluorosilicic acid processing include oil based de  foamers, dioxins, polymers, petroleum products, naphthalene, chlorides,  sulfides and synspar.
     
"Traditionally, 
fluorspar  has been considered to be vital to the Nation's national security and  economy. It is used directly or indirectly to manufacture such products  as aluminum, gasoline. insulating foams, refrigerants, steel, and  uranium fuel. Hydrofluoric acid (HF) was consumed in the manufacture of  uranium tetrafluoride, which was used in the process of concentrating  uranium isatope 235 for use as nuclear fuel and in fission explosives.  It also was used in stainless steel pickling, petroleum alkylation,  glass etching, treatment of oil and glass wells and as a feedstock in  the manufacture of a group of inorganic fluorine chemicals that include  chlorine trifluoride, lithium fluoride, sodium fluoride, sulfur  hexafluoride, tungstun hexafluoride and others used in diaelectrics,  metallurgy, wood preservatives, herbacides, mouthwashes,  'decay-preventing' dentrifices and water fluoridation."
  
   
*  EPA confirmed that the two compounds used almost exclusively in the  U.S. for fluoridation have never, ever been studied for their effect on  health or behavior.  
*  NSF International, the private organization certifying fluoridation  chemicals, confirmed that it is doing so in violation of its own  standard requiring manufacturers to submit any available published and  unpublished toxicological studies on both the fluoride compound and any  contaminants contained in the product. NSF disclosed in the  investigation that they have no such studies on file
https://www.thehealthvine.net/index....d=36&Itemid=58
 
	
		
		 
			
				
					
 Posted in reply to the post by Howard:
					
					
					
					
				 
				
				
					Sorry, I saved the hard copy Sebastopol report from a couple of years ago.  Your welcome to come over and look at my file or call public works.  The Santa Rosa link is: 
https://ci.santa-rosa.ca.us/doclib/D...ort_Online.pdf
I would also disagree with your last paragraph.  There's no difference between the fluoride in one compound versus another.  Fluoride is the negative ion of the element fluorine. It's added to the water via a distillation-like process and contains nothing more than whatever is bonded to the fluoride ion in the gas.  Sometimes its hydrogen and sometimes its silicon.  The compound that was used to derive the gas is left in the tank, so to speak.  The industrial byproduct toxic version you talk about doesn't come close to the water we drink. Natural fluoride, elementally speaking, is no different from the fluoride in the phosphorite rock that most U.S. systems use. This is basic chemistry and you do a disservice to your cause by not understanding it.