Water quality is a term used here to express the suitability of water to sustain various uses or processes. Any particular use will have certain requirements for the physical, chemical or biological characteristics of water ; for example limits on the concentrations of toxic substances for drinking water use, or restrictions on temperature and pH ranges for water supporting animals. Consequently, water quality can be defined by a range of variables which limit the water. Although many uses have some common requirements for certain variables, each use will have its own demands and influences on water quality. Quantity and quality
demands of different users will not always be compatible, and the activities of one user may restrict the activities of another, either by demanding water of a specific quality outside the range required by the other user or by lowering quality during use of the water.
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