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The simplest way to remove fluoride for domestic water supply is using activated charcoal and most effectively, bone char. This, while simple to do is a logistical nightmare, but the Catholic Diocese of Naivasha in the Kenyan Rift Valley where there are serious fluorosis problems, have developed a system for collecting and regenerating the bone char. Apart from the difficulty of controlling the process if carried out at the community level, there is also the problem of the fluorine released during regeneration. A report is available here:

A report was also produced as a result of some studies undertaken in Ghana by students from a university in New York, which I am trying to get a copy of.