On the coast of San Francisco Bay there are numerous colorful ponds, coloring varies from purple to bright green. To rate all the scale and splendor of this phenomenon is possible only from the plane window. From this height ponds resemble the giant stained glass, or an exhibition of abstract art. The phenomenon of the bright color palette of evaporation ponds in San Francisco is not man-made, but completely natural. Such a variety of shades appears to vigorous activity of micro-organisms living in the water.
And all these colorful ponds owned by Cargill, Inc., one of the world leaders in the food industry, and are used for extraction of salt from the sea or ocean water. Under the influence of the sun the moisture in the ponds evaporates, and the salt is deposited. Within five years of distilled water transfers from one reservoir to another, until all the minerals are rinsed side and salt layer is 15-20 centimeters thick does not remain on the bottom.