Kúpeľný prameň - (Spa Spring) erupts directly underneath the Kúpeľný dom (Spa House), and is, without any additional artificial treatment of the water, used for all sorts of medical purposes. Its water contains sulphates, carbohydrates, magnesium and calcium, as well as a high level of carbon dioxide, with an isothermic temperature of 33.3 centigrades. The spring‘s output is about 5 litres of water and 10 litres of spring gas per second.