Purified water is water that has been freed from chemical and microbiological impurities through various processes, such as distillation, reverse osmosis, or ion exchange. It is primarily used in the pharmaceutical industry, where high purity requirements exist but sterility or pyrogen-free conditions are not necessary. Purified water is used in the manufacturing of non-injectable pharmaceuticals, as a solvent, or as a base for the production of products like dialysis solutions, provided it meets certain purity requirements, such as the endotoxin test according to pharmacopeial standards.