Protect Your Health, Treat the Water! – The SODIS Plastic Bottle Method is a simple public-health poster created by the Swiss Federal Institute of Aquatic Science and Technology (EAWAG) to teach people how to disinfect drinking water using sunlight. The method, known as SODIS (Solar Water Disinfection), is designed for situations where clean drinking water is unavailable and conventional water treatment systems are inaccessible or unaffordable.
The poster explains a straightforward four-step process. First, users select a clean, transparent PET plastic bottle with a capacity of less than three liters. Labels are removed, and only clear or slightly bluish bottles are recommended. Second, the bottle is filled with water and sealed. If the water is cloudy or turbid, it should be filtered first. Third, the bottle is placed in direct sunlight for at least six hours. The poster notes that ultraviolet radiation from the sun helps destroy disease-causing microorganisms. If skies are more than half covered with clouds, the exposure period should be extended to two consecutive days. Finally, the treated water can be consumed directly from the bottle to reduce the risk of recontamination.
The infographic specifically highlights diseases such as diarrhea, cholera, and typhoid as illnesses that can be reduced through proper water treatment. It also notes that organizations including the World Health Organization (WHO), UNICEF, and the Red Cross have promoted the SODIS method for improving drinking water safety in developing regions. The illustrated instructions make the method easy to understand even for individuals with limited literacy.
For preparedness-minded readers, the publication demonstrates an extremely low-cost emergency water treatment option that relies only on sunlight and suitable plastic bottles. While it is not a replacement for modern filtration systems, it provides a useful backup method for situations where conventional treatment supplies are unavailable.
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