Medicinal purified water is medicinal water obtained by distillation, ion exchange, reverse osmosis or other suitable methods. It does not contain any additives, and can be used as a solvent or experimental water for preparing common pharmaceutical preparations. In the production of tablets, capsules, oral liquids and drugs for external use, all equipment, containers, inner packages and tools that come into contact with drugs need to be cleaned with purified water. Electrical conductivity is an important index of pure water. The Pharmacopoeia of China (version 20 10) clearly requires that the conductivity of purified water is less than or equal to 2μs/cm. Water for injection is generally distilled from pure water, with chemical purity as high as 99.999% and no heat source.

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