The water quality standards after filtration by pure water machines can vary according to different applications and needs. The following are some common water quality standards, but please note that these standards may vary depending on regional, national, or industry-specific regulations:

PH value: The pH value of pure water is usually required to be around 7.0, close to neutral.

Total dissolved solids (TDS): In general, the TDS of pure water should be very low, close to zero. High purity applications, such as laboratories or electronic manufacturing, may require lower TDS.

Conductivity: The conductivity of high-purity water should be very low, usually measured in microseconds per centimeter（ μ S/cm is used to represent.

Heavy metals and pollutants: Pure water should be effectively filtered to remove most of the heavy metals, organic matter, bacteria, viruses, and other pollutants. The specific requirements may vary depending on the application.

Please note that different industries and applications have their own specific water quality requirements, such as pharmaceutical, food and beverage production, etc. Therefore, it is best to refer to local regulations, standards, or industry norms to understand the accurate requirements for pure water in specific applications.

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