A pure water machine is a device used to prepare high-purity water, usually used in fields such as laboratories and electronic manufacturing. The purity of water is crucial for applications in these fields. The following are some common methods used to represent the purity of pure water machine water:

Conductivity: Conductivity is an important indicator for evaluating the ion concentration in pure water. The conductivity of high-purity water is very low because it contains almost no ions. Usually, the conductivity is measured in microseconds（ μ Represented in units of S/cm or lower.

Total Dissolved Solids (TDS): TDS is a measurement of the total amount of dissolved solids in water, including inorganic salts, organic matter, etc. The TDS of the water produced by the pure water machine should be very low, usually below a few ppm (mg/L).

Oxidation-reduction potential (ORP): ORP reflects the redox properties of water. In high-purity water, the ORP value is usually close to zero because there are almost no redox reactions occurring.

PH value: pH value is an indicator that measures the acidity and alkalinity of water. The pH value of high-purity water is usually very close to neutral, around 7.

Dissolved gas content: The gas content in high-purity water should be very low. Pure water machines usually reduce the gas content in water, such as oxygen and carbon dioxide, through air filtration or other methods.

Organic pollutants: High purity water should be almost free of organic pollutants. By detecting the content of organic carbon (TOC) or specific organic compounds, the level of organic pollutants in high-purity water can be evaluated.

Microbial load: In some applications, such as life science experiments, it is necessary to detect the microbial load in high-purity water to ensure that the water quality meets the requirements.

Ion analysis: Using methods such as ion chromatography to analyze the presence and concentration of specific ions in high-purity water, such as chloride ions, sulfate ions, etc.

Particle matter: High purity water should have very few particles. By using devices such as particle counters, the particle content in water can be evaluated.

The design and performance of a pure water machine will directly affect the purity of water. Assessing the purity of pure water requires combining different measurement methods and ensuring that the obtained water quality meets the requirements of the required application.