WADI - The Indicator for SODIS
WADI is a solar powered UV measurement device that visualizes the process of solar water disinfection (SODIS) 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. WADI is endorsed by the WHO, meeting its microbiological performance criteria and is classified for providing targeted protection.
Application of WADI:
- 1. Fill PET-bottles with water.*
- 2. Expose the PET-bottles and WADI to the sun, and press its reset button.
- 3. Wait for some hours while the sun disinfects the water.
- 4. Watch a happy smiley face appear on the WADI display.
- 5 .Water is ready for consumption.
*Do not use turbid water, or water polluted with metals or harmful chemicals. Use bottles with a maximum volume of three liters only. See FAQ for more.
WADI revolutionizes the way clean water is obtained, providing a cost-effective and sustainable solution for the households, schools and communities of the world’s most vulnerable population. At the same time it also makes a positive contribution towards the reduction of CO2 emissions, as the most common way to disinfect water continues to be boiling, using wood or gas. The use of WADI results in an emission reduction of approximately 1t CO2 per year - CO2 emission impact study conducted by south pole group.
No maintenance, no spare parts, 2-year warranty.
Water resistant and dust proof (IP65), easy to transport.
Simultaneously use of many PET-bottles.
No batteries, no chemicals, no CO2 emissions.
Solar Water Disinfection (SODIS)
Solar Water Disinfection (SODIS) describes a natural process, during which UV-radiation from the sun eliminates harmful pathogens in water, such as viruses, bacteria and protozoa. PET plastic bottles are filled with water and then exposed to sunlight. Over time the sun’s UV-radiation will make the contaminated water safe to drink. The SODIS method was researched and developed by the Swiss water research institute Eawag and is approved by the WHO and UNICEF.