Electroconductivity and potassium permanganate consumption are particularly important in理化 specifications. Electroconductivity is a characteristic indicator of pure water, reflecting its purity and the effectiveness of the production process. Since drinking water is not purified through deionization, this indicator is not evaluated for it. However, for pure water, "purity" is a fundamental requirement. High levels of metal elements and microorganisms can lead to increased electroconductivity. Therefore, the lower the electroconductivity, the purer the water.