Pharmaceutical water is categorized into two main grades based on purity:Pure Water (PW): Purified via reverse osmosis or deionization, PW features controlled microbial limits. It is used for non-sterile manufacturing, oral liquids, and initial equipment cleaning. * **Water for Injection (WFI):** The highest purity grade, WFI is mandatory for sterile and parenteral drugs. Produced through distillation or advanced membranes, it requires strict bacterial endotoxin controls to e