Protected by the rock formations surrounding the spring, Doubia water has maintained a consistent quality over time, as its physio-chemical and microbiological properties meet the strictest legislative standards for natural mineral water. In addition, the absence of pollutants in the general area, combined with the excellent quality of the industrial equipment, ensure that the water remains clean until it is bottled. The naturally high levels of carbon dioxide, acidic carbonates, calcium and magnesium have earned this water its designation as: "Acid-Bicarbonate-Calcium-Magnesium-containing mineral water.