Amy was asking about links for pond info. While I'm still in the research stage myself, I've been hearing good things about Al Zimmer's Pond site. He is in PA. http://www.azponds.com/ If you can arrange it the external pumps tend to use alot less power to operate. The Sequence line is especially good. Here is a link to a pond forum you may enjoy. http://forums.gardenweb.com/forums/ponds/ Enjoy Scott