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A more popular term for this instrument in water quality testing is a turbidimeter. However, there can be differences between models of turbidimeters, depending upon the arrangement of the source beam and the detector. A nephelometric turbidimeter always monitors light reflected off the particles and not attenuation due to cloudiness.
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The low-end test equipment is dominated by few large suppliers, notably Germany's Loviband and Merck, DelAgua & ITS Europe Water Testing of the UK who work globally, and US-based LaMotte. Major manufacturers of in-line equipment include Siemens and Danaher's Hach. Thermo Scientific and Waters are key producers of high-end test equipment. [38]
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According to the EPA, water quality laws generally specify protection of fisheries and recreational use and require, as a minimum, retention of current quality standards. [18] In some locations, desired water quality conditions include high dissolved oxygen concentrations, low chlorophyll-a concentrations, and high water clarity. [19]
The Safe Drinking Water Act requires the US EPA to set standards for drinking water quality in public water systems (entities that provide water for human consumption to at least 25 people for at least 60 days a year). [3] Enforcement of the standards is mostly carried out by state health agencies. [4]
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