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  The choice of E. coli as an indicator of sanitary-bacteriological faecal contamination of water, and hence the possible presence of pathogens in it due to several reasons, the most important are: the identification and quantitative count of coli form bacteria is carried out relatively easily and quickly, the quantitative content of the water E. coli correctly characterizes the intensity of fecal contamination of water coli form bacteria die off in the water a little slower many pathogenic bacteria, therefore, the destruction of coli form bacteria in water disinfection suggests that destroyed as much of the pathogens.
To characterize the bacterial contamination of water also serves as a definition of the total number of bacteria in the water. In open water there is a large amount of algae and aquatic animals. Depending on the degree of contamination of water bodies they may develop various forms of algae and animal organisms, i.e., each degree of water pollution have its own biocenosis. Based on this, proposed a classification system of water pollution on organisms inhabiting them telling that characterizes the different degrees of water pollution (biological method of analysis). The biological analysis is usually used for pre characteristics of water bodies, such as selecting a location abstraction. For a more detailed description of the reservoir in addition to the biological analysis produce chemical and bacteriological examination.
Drinking water should not contain plank tonic organisms, living or dead. Therefore, one of the main objectives of treatment facilities is the complete retention of plankton. This task is complicated by the so-called "blooming" of water, i.e., the mass development of plankton. The water was polluted by the actual plank tonic organisms, products of metabolism and cellular debris of these organisms.
Some bacteria, as well as plants and animals have the ability to bind to the surface of the water pipes and structures, forming at their biological fouling. Last in the form of white threads causes filamentous sulfur bacteria Beggiatoacea, which develops in water containing hydrogen sulfide.
In the presence of iron in water develop iron bacteria that oxidize ferrous iron to ferric sludge separation with ferric hydroxide. In pipes and heat exchangers water cooling systems, favorable conditions for the development of clusters of gelatinous and filamentous bacteria.
Overgrowth of sea water pipelines is mainly due to ingress of organisms in the larval stage, larvae attach to the walls of culverts and their growth due to nutrients derived from the flowing water through the pipes.