As well as the clinically analysed mineral water used in the different indoor and outdoor pools, the spa also boasts a particular radon mineral water ideal for special treatment. This radon-containing mineral water comes from Mount San Vigilio (Vigiljoch) near Merano (Meran), and is used for baths and inhalations. The radon content in the water has a calming and analgesic effect on the central and peripheral nervous system. Treatments with this water are particularly good for osteoarthritis and many other diseases of the bones, joints and muscles. Furthermore, the radon-containing mineral water has a positive effect on the respiratory system, as it strengthens the mucous membranes of the respiratory tract. Before being admitted for a treatment with radon-containing mineral water you must undergo a medical examination at the Merano Thermal Baths.