 At this time, professor Charles Lepierre, collaborating with professor Herculando de Carvalho, repeated the analysis of the waters of Melgaço, which was the first complete examination of the new springs.Radioactive surveys verified that the waters of the new spring were more alkaline and rich in minerals.In 1934, the company "Vidago, Melgaço e Pedras Salgadas" was constituted, absorbing the capital of the "Companhia Portuguesa das Águas Salus".