Todd:

If I may digress a little. I remember last year that you posted a video or picture of your swimming poos with a bunch of Tilapia in it. What did you use for a filtrtion system? IIRC, you were using a boiler to heat the water, so I'm assuming that it was a closes system.

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).