We wash vegetables in our kitchen and perfectly clean water is gone to the sewer system. We want to take a hot shower and running water is lost during a few minutes. Wouldn't it be nice to have a switch in the sink and a double pipe system so that we could store clean water for future use like watering. Or not so clean water to flush the toilet. The idea is to have a double or multiple pipe system and switchs in the bath tub, washbasin, and sink, and be able to reuse the water.
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