The fluoride contained in Sferriê is not added, it is part of the natural composition of the water. It is present in the composition due to local geology. Sferriê does not have any physical and chemical changes. It is bottled directly from the spring in its natural form.
Among the 12 chemical elements naturally present in Sferriê Mineral Water, the fluoride concentration is 0.33 ml/L. According to the Código de Águas Minerais do Brasil / Brazilian Code of Mineral Waters, a concentration equal to or above 0.01 mg/L of fluoride already allows the classification of this water as fluoridated, with Sferriê being classified as Vanadium and Hypothermal Fluoride Mineral Water at the source. Also according to the Código de Águas Minerais do Brasil / Brazilian Code of Mineral Waters, to be marketed as mineral water, it cannot be modified and must be packaged in natura.