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Turbidity, color, SS (suspended solids)
Turbidity refers to the state in which fine particles are dispersed in water, and when light passes through the water, the transmitted light is reduced due to scattering or reflection by these fine particles, which hinders the inherent transparency of the water. It is expressed in degrees, with one degree corresponding to the turbidity when 1 mg of the standard substance polystyrene is contained in 1 liter of water.