The base consists of an array of basins (black) which are filled with polluted water. The sun shines through the transparent lid and heats up the water and the air inside the box. The water evaporates, it can’t escape the box, humidity reaches 100%. Since the lid has a lower temperature (environment temperature), the vapor will condensate and build water droplets at the inside surface of the lid. The surface of the lid is tilted, and condensated water droplets are collected in a channel at the bottom edge of the lid.
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