What is the main difference between purified water and water for injection?

1, different names. Pure water, also known as deionized water, refers to water that meets the hygienic standard of drinking water and can be directly drunk. It can also be called pure substance (chemically). It is widely used in experiments, also called distilled water, because it is mostly made by distillation and other methods. Water for injection refers to the water that meets the requirements of China Pharmacopoeia.

2. The preparation process is different. Purified water process refers to pharmaceutical water prepared from drinking water by distillation, ion exchange, reverse osmosis or other suitable methods. The main functions in medical treatment are cleaning medical instruments, producing drugs, and using water for experiments. Purified water is sealed in containers by electrodialysis, ion exchange, reverse osmosis, distillation and other appropriate treatment methods, without any additives and colorless and transparent.

3. Microbial content is different. The main difference between water for injection and purified water is that it contains no microorganisms and pyrogens, and it is distilled from purified water. Generally speaking, in order to effectively control microbial pollution and bacterial endotoxin level, the design and manufacture of purified water and water for injection system has two characteristics: first, disinfection and sterilization facilities are increasingly used in the system; Secondly, the pipeline distribution system has developed from the traditional water supply pipeline to the circulating pipeline.

Extended data

Purified water and pharmaceutical water should be transported by stainless steel pump, which is convenient for disassembly, cleaning and disinfection. When purified water and water for injection need to be transported by compressed air or nitrogen, the compressed air and nitrogen should be purified.

Purified water should be transported through circulating pipeline. Pipeline design should be simple to avoid blind pipes and dead ends. The pipes shall be stainless steel pipes or other pipes that are proved to be non-toxic, corrosion-resistant and free from pollution ions. The valve should be a sanitary valve without dead angle, and the flow direction should be marked when conveying pure water. Pipelines and delivery pumps for conveying purified water and water for injection should be cleaned, disinfected and sterilized regularly, and can only be put into use after passing the inspection.

The design of pressure vessels shall be undertaken by certified units and qualified personnel, and shall be handled in accordance with the relevant provisions of People's Republic of China (PRC) national standard "Steel Pressure Vessels" (GB 150-80) and "Regulations on Safety and Technical Supervision of Pressure Vessels".