The waters from the Acque Albule spring are sulphurous and hypothermal. They retain the name that was given to them back in ancient times due to their whitish colour (from the Latin word "albula" = chalky-white coloured water), caused by the gaseous emulsion that forms on the surface when there is a decrease in pressure, releasing the dissolved carbon dioxide and hydrogen sulphide from the water. Water arrives at the spa from Lakes Regina and Colonnelle, north of Via Tiburtina, at a speed of 3,000 litres per second. The mineral water maintains a constant temperature of 23°C throughout the year. Chemical analyses in the 19th century confirmed the therapeutic capacity of the Acque Albule waters. We now know that sulphur is a powerful natural antibacterial ingredient with major anti-inflammatory effects.