Thanks for posting the video yogitunes.
This is such a cool design it beckons questions.
Now, that I have watched the video again, it is clear that the drain is shut for each part of the wash process. How does the water recirculate, allowing detergent to wash over all the dishes instead of being flushed out, when it is fed in directly from the hot water supply; rather than being recirculated via a pump (as per electric dish washing)? When the drain is shut during operation, does the incoming water escape the tub via an overflow or does the operator have to monitor how much water enters the tub?
Curious and curiouser.