Hi Stuart I know a farmer here in S.W. Ontario who has a unit, and I have seen it operate. It is quite expensive (about $1K CAN/nozzle), but works quite well - The unit cost $40 K, and they formed a small co-op to share it amongst several innovative farmers. If you need further details, send me an E-Mail and I could put you in touch with this farmer. Bruce Bowman London, ONTARIO CANADA bbowman@julian.uwo.ca