Temperature I: 63,7:oC; II: 60,4oC, CO2 content 363 mg/l, yield I: 4,1; II: 3,6 l/min. The hot mineral spring was discovered under the rock with the St. Bernard statue in 1784. The rock reached as far as the riverbed and closed the road on the left bank of the Teplá River. It was much later that it gave way to the construction of the Mill Colonnade.At the end of the 18th century the spring was so rich and so hot that it was compared to the Sprudel. The pressure of the spring was so big that the thermal water swelled in a wooden pipe to a height of 4.75 metres and passed into a reservoir. Karlovy Vary curative salt was made in eleven boilers - the water evaporated and what was left, was the salt. It is remarcable that the people were able to make use of the natural heat at that time.Bernard Spring as it could be found in the neighbourhood of St. Bernard Rock. Later it became a part of the promenade belonging to the colonnade of the New Spring. Although qualities were similar to those of the Hot Spring , it wasn't used in the drinking cure.In 1872-1882 the Mill Spring Colonnade was built and it changed the arrangement of the springs considerably. Up to that time the vases with the thermal water could be found in the close neighbourhood of the spring, later they were arranged according to the plans of the architect Zítek. The thermal water was collected under the foundations of the colonnade right in the place where it sprang from the rifts in the granite. By means of its upward pressure it was led to the chosen places. All the reservoirs shared a common problem. As soon as the water comes near to the surface, both the pressure and the temperature sink. As a result of it its gaseous components - among them the carbon dioxide - start to separate. The solubility of mineral salts changes too. The calcium oxide liberates from the solution. It is a mineral which is able to form a thick deposit in the pipes and to block them.When ten years ago small Karlovy Vary springs were collected, people came across a big side-spring at a depth of 9.6 m. The delivery head was so big that it was possible to place the vases above the colonnade floor.
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