Grey water, also spelled as gray water, is water that already has been used domestically, commercially and industrially.
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A review of nature-based solutions for greywater treatment: Applications, hydraulic design, and environmental benefits - ScienceDirect
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Keep your lawn and garden lush without wasting resources by capturing and recycling the greywater that drains from your sink, shower, and washing
Greywater Green Landscape
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2019 Honor Award Gray Water System — Idaho Montana ASLA
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