Evaporation

Everyday we pump 31,000 tons (7 million gallons) of seawater into our evaporation dams. Here the seawater will lie while the water is evaporated through the workings of the sun and the wind. Impurities such as Calcium Carbonate (Chalk) and Calcium Sulphate (Gypsum) are deposited at the bottom of the dam. The dams are arranged so that the water can gravitate from the one to the other over controlling weirs. Seawater is at 10% of saturation point (the point when salt crystallization commences). As the water evaporates, and we pump more water into the dams, the concentration of the salt increases, until it reaches 100% of saturation point. The brine (now so called because of increased salinity), is then stored in reservoirs.