Drinking water with fluoride levels above 2ppm can lead to mottling of the teeth enamel or discoloration of the permanent teeth. And, too much fluoride in your drinking water may increase the potential for bone fractures. This utilizes granular activated alumina media that can easily reduce fluoride levels from 0.5 ppm to less than 0.1 ppm. The activated alumina is a synthetic aluminum oxide that removes fluoride more selectively. It is widely used in the water treatment industry for its effective fluoride removal properties.