The intro question kinda spooked me out..<br><br>..then I recognized the lagoon you're talking about, and when my girlfriend took me there a few years back..<br><br>..eww.<br><br>Really though, I never thought too much into where the water came from, I was under the impression it was directly tapped from 'nature/underground', probably from some vague and misleading marketing. I remember eventually the water made my face sting quite a bit, then again once we hit the crisp air walking back to the hotel part.