Watly is part of Telegraph Tech's Startup Saturday series. Every week, we will be profiling a British entrepreneur or startup inventing world-first products or solving gnarly problems using innovative tech. Tweet us at @TelegraphTech with your suggestions.

Imagine a machine that can turn contaminated water from a river, ocean or even sewage into drinking water, while at the same time generating enough electricity to power itself with surplus, and connecting everywhere within a kilometre radius to Wi-Fi.

It sounds too good to be true, but Marco Attisani has created just that. Watly is a solar-powered water purification machine that can service a community of up to 3,000 people.