Gray water is typically any waste water that is used other than the toilet and kitchen sink water. Dark gray water is the same but inclusive with the water that drains from kitchen sink.
Nicholas Burtner is in Victoria, BC, Canada with the amazing Ann and Gord Baird on their off grid established homestead showing us a “dark” gray water gravity fed system that cleans water, yields vermicastings, worms, and waters trees lower in the slopes of the landscape.
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