Water treatment is essential to ensure that the water quality meets certain usage standards. The environmental protection department sets the minimum standard for drinking water, while industrial water has its own specific requirements. When judging the quality of water, physical characteristics such as temperature, color, transparency, smell, and taste are the basic criteria. The chemical properties of water also play a key role, including pH, dissolved solids concentration, and oxygen content. For instance, some grasslands may have a fully dissolved solids concentration of up to 1000 mg/L naturally, but Canada sets a limit of 500 mg/L for drinking water, and many industrial waters cannot exceed 200 mg/L. Even if the physical properties of water meet the requirements, it cannot be used casually if the dissolved solids concentration is too high. The content of radioactive elements is another crucial characteristic that must be monitored, whether they are from nature, nuclear accidents, or nuclear power plants.