Then, after ruling out the rental option, they found mortgage providers were rationing loans for all but the most affluent and safe of potential buyers.
Janin highlights isolated communities in Africa and South America as well as remote islands in Asia that have little or no access to safe drinking water as potential beneficiaries of the technology.
"Chemicals should be safe for their intended use and potential risks faced by children should be an important factor in safe use determinations, " he added.