Helioz is an Austrian Social Enterprise engaged in the development and sale of affordable products for households in low-income countries.

WADI™ - Our Product

WADI™ is a solar powered UV-measurement device that visualises the process of solar water disinfection (SODIS) in a PET-bottle. 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 a PET-bottle safe to drink*.



SODIS is a natural process, in which the UV-radiation of the sun inactivates certain harmful pathogens in the water. The process only requires PET-bottles, which are filled with contaminated water and are then exposed to the sun. The duration of this disinfection process varies and is determined by the sun's UV-intensity. WADI™ was developed to visualise this process and to make it more reliable and practicable for affected people in low-income countries. WADI™ measures the UV-radiation of the sun and lets the user know as soon as at least 99.9% of coliform bacteria in the water have been inactivated. By the use of SODIS and WADI™, the occurrence of waterborne diseases in low-income countries can be strongly reduced.

In comparison to other disinfection methods, the advantage of this technique is that it neither requires filters, chemicals, batteries nor maintenance. SODIS makes sole use of the disinfecting power of the sun's UV-radiation. In combination with WADI™, the method provides low-income households with a practicable and sustainable solution for getting access to cleaner water. WADI™ comes with a product guarantee of two years. Note that water used for SODIS must be free of chemical and metal pollution, and must not be turbid.

*based on at least a 3log10 (99.9%) reduction of coliform bacteria in the water.



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Helioz GmbH | Ruedigergasse 10 | 1050 Vienna | Austria | Tel: +43-1-5850004-44 | Fax: +43-1-8152015 |
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