A natural mineral water (NMW) as defined by Directive 80/777/EEC can be clearly distinguished from ordinary drinking water: - by its nature, which is characterized by its mineral content, trace elements or other constituents and, where appropriate, by certain effects; - by its original state which has to be suitable at source for human consumption. NMW sources have to be continuously kept free from any environmental contamination (microbiological and chemical contaminants) because of their underground origin and the required measures of protection of the sources. Therefore, treatments for the removal of a microbiological or chemical contamination are not allowed by the E.U. N.M.W. legislation.