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Given that information, [[food:cooking:solar oven|solar ovens]] or similar devices that can hold 140F-160F for long periods may provide unpowered hea... ss commonly) float to the top.
=== SODIS ===
SOlar water DISinfection (SODIS) uses sunlight to impro... /pmc/articles/PMC1718112/)) It relies on minimal solar heating of the water, then ultraviolet irradiatio