Mineral water springs in Františkovy Lázně are called acids due to their high content of carbon dioxide. Some mineral springs are suitable for drinking cure, others for balneacation. The springs spring up in different parts of the spa city. Springs suitable for drinking treatment have free accessible outdoor springs. The temperature of the mineral springs in Františkovy Lázně is in the range of 9-11 °C. The mineral water intended for balneation is then heated to the desired temperature. The most famous mineral water spring is Spring František.