Because water is a "universal solvent," there are variations in the quality in a given area. As a result of it's solvent action water dissolves at least a portion of everything it touches. It dissolves metals, rocks, waste matter , gases, dust and numerous other foreign substances and may contain appreciable amounts of these dissolved materials. A laboratory analysis of a water may show that it contains (a) dissolved materials, (b) dissolved gasses, (c) turbidity and sediment, (d) color and organic matter, (e) taste and odor, and/or (f) microorganisms. Because of the many contaminants present in water, a wide variety of technologies have been developed to make water suitable for an intended use: drinking water, laundry, industrial processes, aqua culture, sanitation, fire fighting, osmosis and distillation. Suspended solids are removed by filtration. Gases are removed by oxidation and/or aeration. Microorganisms are removed by boiling, chlorination, ultraviolet disinfections and ozone. To properly correct a water problem, a laboratory analysis of the water and the education, experience and professional qualifications are needed to properly select and apply the appropriate technology.