Water Efficiency: I remember my mother doing this when i was growing up, you say what = Collecting rain water to be used for the garden is a good practice (be sure to check your state and local laws before attempting this). The term graywater refers to water from the home that can be used for watering plants, like water from washing dishes. Also, a recirculating hot water system will prevent people from letting the water run until it's warm. A tankless water heater is defined as green because it only uses energy to heat water when it is needed. Low flow heads on faucets and showers are green innovations also, we really don;t understand all off this yet but its coming.
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