In the sixteenth century proliferated in Poland and Germany about colossal buildings made of wood and branches of oak sleigh whose purpose was to evaporate the water to get salt. In those towers, driven by windmills, water falls drop by drop on the walls, went up seven times by the facility and to gradually evaporate, the concentration of salt increased from 4% to 22%.The towers, called graduation saline, boosted the economy of populations where salt was essential as a preservative for food.
In the Polish population of Ciechocinek are preserved three towers of 16 metres high, built in the nineteenth century on a spring and arranged in a horseshoe shape. Visitors can walk around them and breathe the air rich in iodine due to evaporation of water.
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