It was a water carrier on wheels to be used in developing countries where clean water is not easily accessible. You fill the container with (presumably) contaminated water and by the time you have walked back to your village/camp - it has been purified. Fantastic idea. They wanted £50,000 for 10% of the Company and had all 5 Dragons chipping in 10,000 each for 2% each - they were all fighting with each other to get involved
Now is it just me but am I the only person on the planet who thought that the Christmas Tree disposal bag was also a very good idea????