Greywater has varied applications as non-potable water depending on its source and composition and helps saving fresh water supplies.
Greywater Reuse - Greywater Action
Greywater - Wikipedia
What is greywater? Choosing appropriate greywater systems.
Using Greywater in Your Off Grid Household - Off Grid World
water - GreenSutra®
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A review of nature-based solutions for greywater treatment
Drip.Drop by Zack Bryson - Issuu
Greywater Reuse - Greywater Action