One idea is to provide a means for reusing “graywater” within the system. Graywater is leftover water used in tasks around the home, like washing dishes or doing laundry. It can be used for irrigation purposes, or even to flush toilets, so that we don’t have to use up more clean water. Your bathtub’s drain could lead directly to a series of pipes taking the water to an irrigation project, for example, or the water from your sink could drain to your toilet when you’re done washing your hands with it. Just like this, actually:
(Image from Wikimedia Commons.)
Speaking of toilets, just to reassure you! Toilet water is NOT considered reusable as graywater. It’s called “blackwater” because it’s contaminated with human waste.
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