What are the national standard standards for water use? There are three kinds of water quality, such as distilled water, for the cleaning of glassware, etc .; the second is a water , Mainly for chemical analysis or liquid, atomic absorption and other sophisticated instruments. Customers should be based on the actual water quality needs to use ultra-pure water equipment grade. To tap water as the source of ultra-pure water machine has two (two water quality) outlet, one is pure water, that is, three water; two is a water, that is, ultra-pure water (strictly speaking, a water Of the resistance is greater than 10 megohms, while the ultra-pure water resistance is greater than 18 megohms). The above is about the national laboratory standard water level.