Removing Fluoride From Water >>Activated Alumina Works To Lower Fluoride to Safe Levels in Drinking Water
==> In 1994 the World Health Organization recommended that fluoride levels in water should be contained from 0.5-1mg/L. Fluoride levels above 1mg should undergo defluoridation, which can be done three different ways: with chemicals and precipitation, with membrane based technologies, or with ion exchange and adsorption.
A lot of times these methods are used in combination. For example, when fluoride levels are above 15ppm using lime which falls under the chemicals and precipitation category should be used because they can handle the high levels of fluoride. Once that level is lowered using lime, activated alumina, which falls under the adsorption category, should be used to reduce to the fluoride content to below 1ppm since activated alumina can purify water up to 99%.
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