Coffeebreak for me, busy sanding a lotta wood today, dusty, AHHCHOO!!

I have the arctic freeze-up problem solved, similar to how I solved the same problem with solar hotwater on a wide variety of houses. It has about the same maintenance costs as owning a snow machine. If you get good at using it the cost is near zero, if you are sloppy it might cost $2/day... average cost of a 3bdrm residential system is $8000,  add $2k for drinking water RO-osmosis unit. Many different configurations and models possible.

DIY-tinkerers can make their own as easy as building a boat.
Plans will be available for DIY-guys.

Simple residential units are public domain and non-patentable,
complex industrial applications are patentable and proprietary.

The amount of water it uses is variable, from zero to a zillion gallons per minute if you are using it for boat propulsion/dredging.

I have several PhD electrochemistry engineers in several colleges looking at it and they haven't stumped me on it yet.  ;-p