The springs share many similarities in their basic compositions, with the main differences being in their temperature and the amount of carbon dioxide they possess, thereby producing varying reported healing effects. Colder springs tend to have a slight detoxifying effect, while warmer waters slow down the formation of bile and gastric stomach juices. The springs range 102-163°F and are all clearly marked with a plaque detailing their mineral content and temperature.
The springs themselves are: Thermal Spring (Thermal Spring Colonnade, daily 6am-6:30pm), Charles IV Spring (Market Colonnade, daily 24 hours), Lower Castle Spring (Castle Colonnade, daily 24 hours), Upper Castle Spring (Castle Colonnade, daily 24 hours), Market Spring (Market Colonnade, daily 24 hours), Mill Spring (Mill Colonnade, daily 24 hours), Nymph Spring (Mill Colonnade, daily 24 hours), Prince Vaclav Spring (Mill Colonnade, daily 24 hours), Libuše Spring (Mill Colonnade, daily 24 hours), Rock Spring (near Mill Colonnade, daily 24 hours), Freedom Spring (near Spa III, daily 24 hours), Park Spring (Military Spa Sanatorium, daily 24 hours), Snake’s Spring (Park Colonnade, daily 24 hours), and Štěpánka Spring (Spa IV, daily 24 hours). The springs are free to the public.
Excerpted from the Third Edition of Moon Prague & Budapest.