The scandal surrounding prohibited treatments for Nestlé mineral waters has spread to Switzerland with the revelation that the Henniez brand also used unauthorized depollution processes. Nestlé Waters has admitted to having resorted to illegal practices, including the use of activated carbon filters, which were abandoned at the end of 2022 under the supervision of the Swiss cantonal and federal authorities. The case, which had already affected the French brands Perrier, Contrex and Vittel, raises the question of consumer deception, as the waters claim to be mineral, i.e. without treatment or additives, in line with Swiss requirements. An investigation in France revealed that bottled water from numerous brands had been secretly purified illegally. The French Public Prosecutor's Office has opened a deception investigation against Nestlé Waters, seeking to determine whether the description "natural mineral water" is misleading, given the ban on disinfection devices for this category of water.