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  Turbidity is one of the most important parameters used to determine drinking water quality. Turbidity is considered as a characteristic to identify the pathogens in drinking water. In natural water, turbidity measurements are performed to assess the overall water quality and its compatibility in applications involving aquatic organisms. The monitoring and treatment of sewage or was once just based on turbidity control. Currently, the measurement of turbidity at the end of the wastewater treatment process is needed to verify that the values ​​are within specified standards.

Water turbidity is an optical property that causes light to be scattered and absorbed, rather than transmitted. The scattering of light passing through a liquid is primarily produced by existing suspended solids. The higher the turbidity, the greater the amount of scattered light. Even a pure liquid will scatter light to a certain extent, meaning that no solution has a zero turbidity value.