Hector and Gabriel
Finalist of the Global Children's Designathon 2017, UK
A wall with an inbuilt filter to desalinate and clean water by sucking up water via a pipe, sending it through a filter and then evaporating the water. The evaporate would be re-condensed into clean fresh water, and can be supplied in pipes directly to homes. The salt would be collected in a container (powered by solar energy and batteries) and taken factories to be sold. This was a working prototype They thought of the whole cycle.