WADI BY HELIOZ
WADI is a solar powered UV measurement device that visualizes the process of solar water disinfection in PET bottles. It is placed alongside bottles that are filled with contaminated water and exposed to the sun. Once the process is completed, a smiley face on the WADI confirms that the water is safe to drink.
2014 SIT finalist
Country(ies) of implementation: Austria, across the world