The Aquasana reduces fluoride by 40-60 percent as it will only get two of the five isotopes of fluoride with activated carbon. This does get the influent levels down to around 0.5 ppm. All research showing negative effects have shown it at levels above 1 ppm. The Aquasana System will typically reduce fluoride to below 0.5 ppm or lower but if you need a greater amount removed there are some specialty filters with activated alumina as a filter media. Aquasana will not make an activated alumina cartridge until it is known what the health effects of consuming water high in alumina are.