Fluoridation
Sir, —After Paul Maling’s reply to my last letter I suggest that he learn the mechanism by which an ion exchange resin removes foreign ions from water, and discover that water charged) ions such as fluoride have a much higher conductivity than deionised water. The absence or presence of such ions can be established by the measurement of the conductivity with an extremely simple device, which need not be very accurate. When the conductivity increases to a predetermined level, the resin is recharged or replaced. For those incapable of building a deioniser, such systems are available and inexpensive.—Yours, etc., PETER D, JAMIESON. September 20, 1980.
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Press, 24 September 1980, Page 24
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106Fluoridation Press, 24 September 1980, Page 24
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