“W+W” by Gabriele and Oscar Buratti

Milan designers Gabriele and Oscar Buratti have created the combined toilet and wash basin, where waste water from the sink is used to fill the toilet cistern. The idea itself is not new, but has been designed to look sleek and worth installing in a modern apartment.

Called W+W, the eco toilet is made with the collaboration of Roca Innovation Lab. If the reservoir is empty, the toilet cistern can be filled from mains water.

Highlighting its commitment to design and innovation, Roca has combined these two elements to create W+W – an all-in-one washbasin and WC made from vitreous china, designed to maximize space and conserve water. This idea is reducing water usage by up to 25% compared to a standard 6/3 litre dual-flush WC.

When the grey 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 odours, 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. In addition, if for any reason there isn’t any grey water stored in the reservoir, for example if the basin hasn’t been used, the float will recognize this and trigger the inlet to fill the cistern from the mains.