Royal holy blue mineral water is good. Royal holy blue mineral water has the function of health preservation, which originated from a shepherd's accidental discovery. The news soon spread all over Spain, and ordinary people came to the San Blue Valley to get water for health. On March 27th, A.D. 1790, King Charles IV of Spain officially declared that the spring water in Solandi Caras Canyon had extraordinary effects. And listed it as a royal special health care option.