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See Chinese contents: GB 34914-2021 GB 34914-2021: Minimum allowable value of water efficiency and water efficiency grades for water purifier
This document specifies the minimum allowable value of water efficiency and water efficiency grades, technical requirements, and test methods for water purifier. This document applies to small water purifiers which use municipal tap water or other centralized water supply as raw water, and use reverse osmosis membrane or nanofiltration membrane as the main purification element for use in households or similar places.
