bacteria cause disease: cause of diseases spread by water as diarrhea, food poisoning, jaundice ... N, P: this is the maximum amount of nutritional elements. If the concentration in the water too high leading to the phenomenon of street culture, which is rich in the development of the algae outbreak, makes the concentration of oxygen in the water is low at night and cause inhalation of aquatic organisms, while on board a very high oxygen concentrations due to the respiratory process of algae. color: opaque or black out, causing the loss of America. greasy: cause odor, prevents the diffusion of oxygen on the surface.
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