Temperature 61,4oC, CO2 content 572 mg/l, yield 5,2 l/min.When the construction of the Castle Colonnade was being prepared in 1911,the head of the Karlovy Vary Spring Office, Robert Kampe, made an interesting suggestion to the author of the building project, the architect Ohmann from Vienna. His idea was to bring a small part of water from the Lower Castle Spring to a level which would have been several metres higher. A part of the thermal water from the reservoir of the Lower Castle Spring is diverted to a small pavilion which was built over this "new" spring in 1912.The mixture of water and gas is lighter than water according to physical laws. It means in the case of Karlovy Vary springs that the delivery height of each of them depends on the amount of gaseous carbon dioxide which the thermal water contains. In this case a very narrow pipe was used. Thermal water with a very high amount of carbon dioxide (about 1 litre/min) was led through it from the Lower Castle Spring as far as the pavilion of the Upper Castle Spring. This technical "innovation" had another effect: the final values of the "new" spring differed considerably from the original source. The explanation is easy: during its way through the pipes the temperature of the thermal water sinks and the solubility of carbon dioxide increases. In the case of the Castle Spring the temperature sank below 50oC and the amount of dissolved carbon dioxide rose to 763 mg/l. (Compare: the temperature of the Lower Castle Spring was 62,3oC and it contained 660mg CO2/l).The Upper Castle Spring ranked among the twelve springs which were used in the drinking cure.
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