I have a client that bought 2 of these, and I can tell you they really, really work.

There are 1"-2" of dead bugs in the collector at the bottom (which you can remove) every few weeks. Amazing.

http://www.flowtron.com/mm5/merchant.mvc...ronicFlyControl

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).