The WHO issued a new guideline for production of water for injection (WFI) by means other than distillation on 20 May 2020. It is contained as Annex 3 within WHO Technical Report Series, no. 1025 (WHO Expert Committee on Specifications for Pharmaceutical Preparations: fifty-fourth report), which can be found at: https://www.who.int/publications-detail/978-92-4-000182-4