The biggest archipelago in the world is run out of water, quite a paradox for Indonesia. Even-though Indonesia is covered by 3.544.744 km² sea surface, it is not equal to the clean water provider. Thus, in 2015 two Indonesian students created an innovation to transform saltwater to a drinking water. In 2016 the Indonesian government has applied this concept in some big cities in Indonesia started by the capital Jakarta and the city of Riau. In the last decade, Indonesia has suffered a water crisis due to many reason including the growth of the population (from 232 million in 2007 to 258 million in 2017), the uncontrolled use of water resistant, climate change as well as inefficiency in water management such as rainwater harvest (only 25% of the rain water is used whereas Indonesia has half-year rainy season). The recent study shows that 70% of lower class in developing countries possessed mobile phone while the percentage of tap water is far less, Indonesia is one of the perfect example. Therefore Indonesian government is investing greatly in clean water projects.