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This is the filter I researched and decided was the best one I could find: http://www.promolife.com/cart/water...oride-removal-filters/four-stage-undercounter (it also removes chlorine and a host of other toxins).
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This is the filter I researched and decided was the best one I could find for filtering out fluoride: http://www.promolife.com/cart/water...oride-removal-filters/four-stage-undercounter (it also removes chlorine and a host of other toxins).
I think the best option, if you want to incur the cost, would be to have your water tested 3-4x a year. Send two samples...one sample unfiltered and one sample filtered. Send samples to be tested when the filters are new, at 3 months of use, 6 months of use and possibly 1 year. Depending on the level of fluoride in your water to begin with and how much filtering you are doing, you'll get an idea of how long the filters will last you. If at 6 months they are still removing most of the fluoride, you could test again at 9 or 12 months. None of the fluoride filter makers will really come out and say their filter will "last x number of months" because, 1) fluoride is hard to remove (it needs a long contact time with the filter media, hence the 4-filter setup I sent you the link for) and 2) Different water sources will have different levels of fluoride and 3) It depends upon how much water you are filtering. I think Promolife has a hard stop on their filter that it can't be any more than a certain PPM of fluoride, otherwise they won't guarantee it's removal. If you live someplace where the municipality adds a known amount of fluoride to the water, that is easier to deal with than ground water that naturally has high levels of fluoride.
If you could get your hands on some bone char (or make your own), you could make a gravity fed system that I think would outperform/last the Promolife one mentioned above, at much less cost.
Here is a paper discussing the use of bone char in Africa. There are several such papers on the internet out there, this is just the first one I came up with in a search:
http://wedc.lboro.ac.uk/resources/conference/34/Korir_H_-_189.pdf