WADI - The Indicator for Solar Water Disinfection (SODIS)
What is SODIS?
SODIS describes a process, in which the UV-radiation of the sun inactivates harmful pathogens in the water. PET-bottles are filled with contaminated water and are 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 and endorsed by WHO and by UNICEF.
What is WADI?
WADI makes the use of SODIS more reliable and practicable. WADI is a solar powered UV-measurement device that is placed next to the PET-bottles and serves as an indicator for SODIS. A happy smiley face on the WADI display indicates the point in time at which the UV-radiation of the sun has made contaminated water in PET-bottles safe to drink.
SODIS in combination with WADI provides households and communities with a cost-effective and sustainable solution for access to safe drinking water.
Advantages of WADI:
- Sustainable: no maintenance, no spare parts, 2-year warranty.
- Practicable: water resistant and dust proof (IP65), easy to transport.
- Scalable: simultaneously use of many PET-bottles.
- Environmentally friendly: no batteries, no chemicals, no CO2 emissions.
Scientific product performance:
WADI meets WHO microbiological performance criteria for household water treatment technologies and is classified as providing targeted protection. WADI performs highly against bacteria and protozoa, and demonstrates reasonable performance against viruses.