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See Chinese contents: GB/T 18920-2020 GB/T 18920-2020: The reuse of urban recycling water -- Water quality standard for urban miscellaneous use
This Standard specifies the terms and definitions, water quality indicators, sampling and monitoring, safe use of water for urban miscellaneous use in the reuse of urban recycling water. This Standard applies to reclaimed water for miscellaneous use, such as toilet flushing, vehicle washing, urban landscaping, street sweeping, fire protection, construction site and concrete production.
