If you have a small living space, especially a small bathroom, this combination sink and toilet may be just the thing for you. The item, already available in Europe, saves up to 25 percent of water waste compared to a standard toilet by reusing sink water to flush waste down the (toilet) drain.
The leading online UK plumbing publication Plumbing Park has this to say about the dual toilet/sink:
The basin waste and one further down the waste pipe. Once the basin has been used and filled with water, the user has the option of either diverting it to the mains (e.g. if the basin is being used for shaving, or brushing teeth), or recycling it by storing it in the cistern ready for the next flush.
When the gray water is selected to be reused, it is stopped from flowing out to the mains at the secondary waste and diverted to fill up the cistern, at which point it automatically passes through a double filtration system. In order to eliminate bacteria and odors, this system filters particle debris as well as chemically treating the grey water before storing it to flush the WC. Once the water has been filtered and treated, it is then stored in the grey water reservoir and used to fill the cistern as required. The reservoir holds up to 4 litres of water, and there is an overflow so that if it gets too full any excess grey water will be discarded via the main waste outlet.
[Via: Jetson Green]
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Love it! So smart.