By the way, Google "fluidics" for further information. I recall reading Popular Science, back in the '60's, when this technology was right up there with flying cars...
It seems to have dropped into the bottomless pit of "Almost..."
***Only during the summer. The system locked up from December to March.***
In the winter they would just replace the water with Vodka. Then throw a party when the weather warmed up again! ;-)