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The water in artesian wells is in aquifed beds netween impermeable barriers and thus is protected from the surface pollutions. Rainwater seeps deep into the ground and saturates with carbon dioxide.
Enriched with carbon dioxide the water runs throught the pore spaces and fractures of earth materials and dissolves different minerals - calcium, magnesium, sodium, с.
The water with high concentration of dissolved minerals is widely used in resorts for preventing treatment of various diseases.