Solar Disinfection Measuring Device (WADI™)
WADI™ is an easy-to-use and cost-effective UV measurement device that operates without the use of chemicals and filters. It helps to reduce water-borne diseases and is suitable for daily usage. Handling of WADI™ is easy: Put WADI™ onto the water-filled PET-bottle like a screw cap, expose both WADI™ and the PET-bottle to the sun and wait. As soon as a happy smiley face appears on the display, the water is potable. Under favourable conditions, the solar water disinfection process takes a few hours.
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❊ Viable method for household water treatment (SODIS)
❊ Smiley Face indicates when the sun has made water in a PET bottle safe to drink
❊ Pathogens in water are inactivated by the Sun’s UV Radiation
❊ No chemicals, no batteries or filters required
❊ Cost effective
❊ Promoted by both WHO and UN