The Fluoride Filter produces clean, mineralized alkaline water for up to 4 months through its advanced 6-stage filtration system. Fluoride is known to have adverse health affects such as neurological and thyroid problems; Santevia's Fluoride Filter is the perfect solution for reducing this harmful contaminant from tap water. *Adds healthy minerals calcium, magnesium, potassium and other trace minerals *Makes water alkaline, which helps the body maintain optimal ph *Reduces fluoride up to 98% *Reduces chlorine up to 99% *Filters agricultural contaminants, heavy metals and pharmaceuticals *Compatible with all models of the Gravity Water System