Hire Rainman to do an aluminum sulfate/hydrated lime application. Basically the same thing for less $$.

I have a client that has roughly 30 surface acres of water that is nutrient heavy. I'm trying to get them to spend the money to do a nutrient reduction program, and he is who I'd call to do the application.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).