This is awesome. Basically it separates the water into two layers, with a sort of a filter of black plastic. The plastic has holes that are optimized such that

This is awesome. Basically it separates the water into two layers, with a sort of a filter of black plastic. The plastic has holes that are optimized such that you get a layer of hot water up top that evaporates easily, but that still allows the movement of salt to prevent the buildup of a really salty brine. Neat, elegant.