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BACKGROUND Gastroesophageal reflux disease (GERD) is one of the most common gastric pathologies. Recently, there has been a growing interest in the healing effects of mineral waters (MW). METHODS 90 patients with GERD were under observation. The study used the following methods anamnestic, clinical, studies of biochemical blood parameters, ultrasonographic studies of the digestive system, fibroesophagogastroduodenoscopy with intragastric pH-metric. After preliminary research, all patients were randomly divided into three groups of 30 pe