Solar-powered WADI device

WASH and Water Security
Solar-powered WADI device

WADI is a solar powered UV measurement device that visualizes the process of solar water disinfection (SODIS) in PET or Glassbottles. 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.

WADI is simple, reliable and easy-to-use. Obtaining safe drinking water with WADI can be achieved through five simple steps.

1. Fill PET- or UV-permeable glass bottles with water
2. Expose the bottles and WADI to the sun, and press the reset button
3. You can track the progress bars for a few hours while the water is disinfected
4. Watch a happy smiley face appear on the display when the process is completed
5. Water is safe for consumption.

The smiley face appears as soon as the incident UV-dose reaches that of the reference values stored in WADI and the water is safe to drink (removal of 99,99% of common harmful viruses, bacteria and protozoa). WADI in combination with SODIS is highly effective against bacteria, protozoa and viruses.

Welthungerhilfe India is reaching out to 5000 direct and 25,000 indirect beneficiries in Jhansi in Uttar Pradesh and Madhubani in Bihar.

2500 families in each district will directly benefit from guided water management and capacity building activities and will receive trainings on Solar Water Disinfection (SODIS) with WADI. Every household is to receive a WADI to secure the provision of safe water in their own household.