WADI is a solar-powered, IP65 conform produced, 100% maintenance-free, portable UV measurement device that uses simple progress bars and smiley faces to visualise the process of solar water disinfection (e.g. SODIS). It measures the UV-A and UV-B radiation of the sun and indicates the point of time at which at least a 3 log10 reduction of coliform bacteria has taken place. The visualization of the progress of the solar disinfection process on the one hand eliminates the user uncertainty on the e.g. SODIS requested timing of 6 hours (which in some areas is difficult to follow), on the other hand allows for two solar disinfection cycles per day under ideal geographical and weather conditions. In order to further improve the process of solar disinfection, WADI also allows for a simple and effective pre-filtering by use of locally available tools (e.g. cloth/cotton/napkin/pad) if water is turbid. Apart from this pre-filtering, WADI does not actively treat water.
WADI works energy self-sufficient and has a guaranteed life time of at least two years
Worldwide, there are over 780 million people without access to an improved drinking water source. The problem is usually not water shortage as such, but lack of disinfected, drinkable water. In many countries, drinking water is contaminated with harmful bacteria or viruses. 80% of all illnesses and deaths caused by diseases in developing countries derive from insufficient or contaminated drinking water supply. Each year, 1.5 million children under the age of five die because of unsafe water.
Ex works (Austria) sales prices for WADI range between 13,50-17,00 USD. These prices do not yet include transport charges, duties, local taxes and margins for the distributor. Final prices for end consumers will therefore be considerably higher.
In order to enable the poor to afford WADI, we also encourage companies to take part in corporate social responsibility (CSR) projects, in which they can have WADI branded with their logos and then in doing so subsidize WADI for base-of-the-pyramid consumers.
Stage of development: produced in serial production
WADI is a UV measurement device that visualises the process of solar water disinfection. A happy smiley face will appear on its display as soon as the water is safe to drink.
Solar water disinfection is simple: Contaminated water is filled into a transparent PET-bottle, which is then exposed to the sun. The UV radiation of the sun kills pathogens in the water and can thereby reduce waterborne diseases such as diarrhea. Solar water disinfection is approved by the WHO for being a viable and effective water disinfection method.
- no maintenance
- no batteries
- no chemicals
- no filter
- 2 years guarantee
Organization: Helioz GmbH - Austria
Contact: Gerald Enzinger
Used by: Amongst others Kenya, Ghana, India, Uganda, Tanzania, Philippines