The mineral waters are one of the most precious natural resources in Bulgaria. There are more than 500 hydrothermal sources with a total flow rate of 3000 L/s, having different temperature and mineral composition. Almost all of them are thermal as the temperature varies in a wide range from 20 oC to 100oC. About 33 % of the total discovered flow rate is of temperature between 20oC-30oC, and 43%-between 40oC-60oC
About 70% of the thermal waters are slightly mineralized with fluoride concentration ranging from 0.1 to 17mg/L, various metasilicic acid concentration (up to 230mg/L) and of mostly low alkalinity. In comparison to most of the European mineral waters, the Bulgarian ones have a lot of advantages: low TDS close to the optimal one typical for potable water, high purity level especially in terms of anthropological pollution, microbiological purity and a variety of water types. Mineral waters in spa centers at most of the sites, flow out of taps. This allows a free-of-charge and massive water use for drinking and disease prevention. In the capital city area alone, there are six mineral water springs provided by fountains.
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