Clean Water is a project that aims to develop a water purification system that is affordable, efficient and sustainable. The system must be based on open source technologies, so that it can be replicated and adapted by anyone. Filtration: Filtration is a technique that removes particles and contaminants from water. Disinfection: Disinfection is a technique that kills pathogenic microorganisms in water. Heating: Heating can be used to kill pathogenic microorganisms and remove organic contaminants. Photocatalysis: Photocatalysis is a technique that uses light to break down contaminants in water.