The Acqua di Fiuggi ("Fiuggi's Water") source runs through ancient volcanic deposits in the Ernici mountains which has an ecosystem that has historically been unaltered by humans. In Europe it is classified as an Oligomineral water, and has been proven to contain certain components of the "humic substance" group which, it is claimed, gives the water its health benefits.[4] Fiuggi has been proven to be effective in breaking down and flushing out kidney stones from the body and helping to improve kidney function.[5]