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Turbidity is an indication of apparent colour of Water on account of suspended inorganic matter such as silt, clay and mud particles. The turbidity is expressed in silica scale.
Water is turbid when it contains visible material in suspension such as clay, silt, finely divided organic matter and or microscopic matter. NTU stands for nephelometric turbidity unit.
Threshold odour number is dilution ratio at which odour is just detectable. The odour can be estimated by osmoscope whereas colour can be estimated by calibration method.
The water is considered soft when ppm is between 0 ? 50.
Most probable number is a number which represents bacterial density which is most likely to be present. It is one of methods to estimate bacterial quantity of water.
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