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 230 mg/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 (Vladeva and Karakolev, 1996). 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.
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 230 mg/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 (Vladeva and Karakolev, 1996). <br>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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