|MadSci Network: Chemistry|
A strong base anion exchange resin, or a mixed cation/anion resin should do the trick. Fluoride is second to sulfate as the least selective anion removed by such resins, however. I operated water treatment systems at a nuclear plant. We took hard lake water and made ultra-pure, fluoride-free (<0.1Umho/cm)water from it by a series of pretreatment flocculants, sand and carbon filters, reverse osmosis, degassifiers, then through trains of demineralizers with cation, anion and mixed bed resins. We used Dowex resin, which is a styrene gel bead type using a quaternary amine or sulfonic acid functional group. The cation and anion resins were regenerated by sulfuric acid and sodium hydroxide, respectively. Depending on the amount of water and the size of your operation, you might look to Dow Chemical or to a simple scientific supply catalog such as Fisher. More on resins may be found at: http://www.remco.com/ix.htm Ciao.
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