I put 2 explainatory videos on utube They are at
http://www.youtube.com/watch?v=QOn7Zu3CCxo
and at http://www.youtube.com/watch?v=0topdMcpNMk
The first one takes 6 and a half minutes and the second one takes 2
minutes to view. (But download times may be longer).
Please pass the urls on to anyone you think might be interested in
researching the pump.
Thank you
Brian