The European pharmacopoeia permits distillation as the process for producing WFI

(Water for Injection). Distillation involves boiling water and then condensing the steam to produce highly purified water. This process effectively removes impurities, minerals, and microorganisms from the water, resulting in a product that meets the strict standards set by the European pharmacopoeia. Distillation is considered a reliable method for producing WFI and is commonly used in pharmaceutical and healthcare industries for various applications.