Minimum allowable value of water efficiency and water efficiency grades for reverse osmosis drinking water treatment purifiers

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. This document does not apply to large water purifiers with a length or width or height ≥2000 mm, mass ≥100 kg, and purified water flow rate ≥3 L/min.