Water for Injection (WFI) is a highly purified, pyrogen-free water used in pharmaceutical and biotech applications, ensuring safety and sterility in critical processes WFI System is a highly purified form of water that meets stringent quality standards required for critical applications, particularly in the pharmaceutical and biotechnology industries. It is extensively used in the preparation of medications, cleaning of equipment, and other processes where microbial and chemical purity is essential. This article explores the characteristics, production processes, applications, and regulations surrounding Water for Injection, making it a comprehensive guide for professionals and enthusiasts alike.