Water is one of the major utilities used by the pharmaceutical industry. Different grades of water quality are required depending on the different pharmaceutical uses. Control of the quality of water, in particular the microbiological quality, is a major concern and the pharmaceutical industry devotes considerable resources to the development and maintenance of water purification systems.
Water for Injection (WFI) may be present as an excipient or used for reconstitution of products, during synthesis, during the production of the finished product, or as a cleaning agent for rinsing vessels, equipment, primary packaging materials, etc. Therefore sterile water which is free of viable contamination is a necessity for the quality of the end pharmaceutical product.