Solar Water Disinfection & Filters

A thoroughly referenced study from Applied and Environmental Microbiology, entitled “Bactericidal Effect of Solar Water Disinfection under Real Sunlight Conditions.”

Aqua Sun International was formed to bring cleaner and safer drinking water to people in areas of the world where water purification and electrical power are impractical or unattainable. Aqua Sun began designing and building residential and commercial solar systems in 1973.

An article entitled, “Making the most of a scarce resource: Solar disinfection of drinking water in the arid zone of western Rajasthan.” Rajasthan is the largest state in India, occupying just over 10 percent of the total area of the country. Exposure to waterborne infectious diseases is a significant issue in rural India, where almost three-quarters of the population lack access to a reliable source of safe water and where diarrhea and similar diseases linked to the consumption of water contaminated with pathogenic microbes represents a continuous threat to the local people. This is especially so in arid areas such as western Rajasthan, where treated water is a scarce resource.

An article from Energy Resource entitled “Providing Solar, Water Filtration Technology for Clean-Water Initiative Launched by Dynoil.” GE is supplying its ecomagination-certified solar energy modules and water filtration technology for a new initiative launched by Dynoil aimed at increasing the availability of clean drinking water in rural areas of India and in other developing countries of Southeast Asia and Africa.

Currently, 23 percent of rural Hondurans and 22 percent of rural Dominicans do not have convenient access to a clean and reliable water source. As a result, many suffer from malnutrition, which blocks physical and intellectual development and makes them more susceptible to potentially fatal infectious diseases such as cholera or typhoid. In 1995 Enersol implemented two pilot renewable energy-powered community water systems. Based upon this pilot model project, Enersol developed a total of 17 AguaSol Projects: 13 in the Dominican Republic followed by four in Honduras.

Faith in Action International assists communities in educating, training, and improving their water supplies by capping springs, constructing rainwater reservoirs, installing solar water filters and construction and installation of bio-sand water filters.

The Solar Water Disinfection (SODIS) process is a simple technology used to improve the microbiological quality of drinking water. SODIS uses solar radiation to destroy pathogenic microorganisms which cause waterborne diseases. This site has illustrated step-by-step guidelines for using SODIS.

Sandec is the Department of Water and Sanitation in Developing Countries at the Swiss Federal Institute of Aquatic Science and Technology.

The study is entitled “Solar Water Disinfection—A Water Treatment Process Used at Household Level.” The aim of the SODIS WATER project is to demonstrate that solar disinfection of drinking water is an effective intervention against a range of waterborne diarrheal diseases at household level and as emergency relief in the aftermath of natural or man-made disasters.

This site is maintained by EAWAG (the Swiss Federal Institute for Environmental Science and Technology) and SANDEC (EAWAG’s Department of Water and Sanitation in Developing Countries). They have developed and tested the Solar Water Disinfection Process (SODIS). This is a simple, low-cost technology with a great potential to improve the health of those still without access to safe drinking water.

Solar Liberty Foundation is dedicated to assisting people in rural areas of developing nations with renewable energy resources. The goal at Solar Liberty Foundation is to harness the power of the sun to provide people in need with solar electrification, solar water filtration, and solar cookers.

This study was originally published by UNICEF. Entitled, “Solar Disinfection of Drinking Water and Oral Rehydration Solutions—Guidelines for Household Application in Developing Countries,” it was produced by the Department of Environmental Health, Faculty of Health Science at the American University of Beirut.

An extremely detailed, researched and referenced article assessing the germicidal action of sunlight upon water.

WaterHealth International has a mission to provide sustainable access to clean, safe water to all, including the poorest communities. WaterHealth is already providing such access to clean water to hundreds of thousands of people around the world. They are dedicated to extending the reach of their innovative, clean-water solutions to make a positive and lasting difference in people’s lives.

The science of the SODIS system is proven with over 20 years of research ( The water SCH2OOL has taken this technology and developed a successful and sustainable implementation program that operates through the women and children of target communities. The FAQ has many helpful questions and answers.

This report is entitled “Managing water in the home: accelerated health gains from improved water supply.” There is now conclusive evidence that simple, acceptable, low-cost interventions at the household and community level are capable of dramatically improving the microbial quality of household stored water and reducing the attendant risks of diarrheal disease and death.

The World Water Assessment Program (WWAP) is the flagship program of UN-Water. Housed in UNESCO, WWAP monitors freshwater issues in order to provide recommendations, develop case studies, enhance assessment capacity at a national level and inform the decision-making process. Its primary product, the World Water Development Report, is a periodic, comprehensive review providing an authoritative picture of the state of the world’s freshwater resources.