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Some time ago I worked at the Rural Industries Innovation Center in Botswana where they have an issue with saline water. For some communities they were using solar distillation methods. RIIC was looking into ways of making the stills at low-cost so they were constructed from soil blocks and then painted.

There is a little bit of information on the Practical Actioin document https://answers.practicalaction.org/our-resources/item/solar-distillation

Some time ago I worked at the Rural Industries Innovation Center in Botswana where they have an issue with saline water. For some communities they were using solar distillation methods. RIIC was looking into ways of making the stills at low-cost so they were constructed from soil blocks and then painted.

There is a little bit of information on the this Practical Actioin document Action document: https://answers.practicalaction.org/our-resources/item/solar-distillation