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Turbidity refers to the degree of obstruction a solution creates to the passage of light. Turbidity is caused by suspended substances such as sediment, caly, organic matter, inorganic matter, plankton and microorganisms in the water, which can scatter or absorb light. Suspended solid matter refers to solid matter suspended in water, including inorganic natter, organic matter, mud, sand, clay, microorganisms, etc. that are insoluble in water. Usually suspended matter in water refers to the solid matter that is trapped on the filter membrane when the water sample passes through the filter membrane with a pore size of 0.45μm, and is dried at 103~105℃ to a constant weight. In actual applications, some customers cannot distinguish between turbidity and suspended solids, so in order to avoid this cognitive confusion,