Jisho

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Noun
1. gray-water system; grey-water system; recycled waste-water
Wikipedia definition
2. GreywaterGreywater is wastewater generated from domestic activities such as laundry, dishwashing, and bathing, which can be recycled on-site for uses such as landscape irrigation and constructed wetlands. Greywater differs from water from the toilets which is designated sewage or blackwater to indicate it contains human waste.
Read “Greywater” on English Wikipedia
Read “中水道” on Japanese Wikipedia
Read “Greywater” on DBpedia

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