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2. Wastewater quality indicators - Wikipedia

   en.wikipedia.org/wiki/Wastewater_quality_indicators

   Settleable solids are measured as the visible volume accumulated at the bottom of an Imhoff cone after water has settled for one hour. [2]: 89–98 Turbidity is a measure of the light scattering ability of suspended matter in the water. [2]: 131–137 Salinity measures water density or conductivity changes caused by dissolved materials.

3. Turbidity - Wikipedia

   en.wikipedia.org/wiki/Turbidity

   Turbid creek water caused by heavy rains. The measurement of turbidity is a key test of both water clarity and water quality. [citation needed] There are two standard units for reporting turbidity: Formazin Nephelometric Units (FNU) from ISO 7027 and Nephelometric Turbidity Units (NTU) from USEPA Method 180.1.

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5. Category:Water quality indicators - Wikipedia

   en.wikipedia.org/wiki/Category:Water_quality...

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6. Total suspended solids - Wikipedia

   en.wikipedia.org/wiki/Total_suspended_solids

   In water quality monitoring situations, a series of more labor-intensive TSS measurements will be paired with relatively quick and easy turbidity measurements to develop a site-specific correlation. Once satisfactorily established, the correlation can be used to estimate TSS from more frequently made turbidity measurements, saving time and effort.

7. Nephelometer - Wikipedia

   en.wikipedia.org/wiki/Nephelometer

   The unit is called Formazin Turbidity Unit (FTU). Nephelometric Turbidity Units (NTU) specified by United States Environmental Protection Agency is a special case of FTU, where a white light source and certain geometrical properties of the measurement apparatus are specified. (Sometimes the alternate form "nephelos turbidity units" is used [7] [8])