This was a good one.  I don’t remember much about how the product worked – it cleaned swimming pools without the need for chlorine, but I do remember going to the Pool and Spa Show in Las Vegas… lots of bikinis.  My thinking was that the best way to show that the result was sparkly clean water was to emphasize the science and show the water.  An apparently revolutionary idea – we won a best of show award.  I think this was one of my first eco projects.