Actually, I believe that the principle is about running an air flow through the mist, so that the fine droplets of water can dissipate their heat into the air. The mister/shower head is only there to give the water a greater surface area. So the water is not evaporated, it's simply circulated.
Theoretically, the hot air is what's evacuated, but the problem with all bongs, is that it'll drag some of the coolant with it, and that's why I suggested a way to recuperate that coolant.
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