Fluoride that we put in water today will still be in water tomorrow. Fluoride doesn't magically disappear from water once it has been added. Its presence and accumulation have profound implications for aquatic and terrestrial ecosystems. It is not a simple matter to remove the fluoride from water or from the plants and animals that ingest it.
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http://chemistry.about.com/od/chemistryarticles/a/aa090704a.htm
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