I employ the same measures as George not only for my customers but for my own personal pond. I should be more specific and say for my customers that we push the envelope with regarding growing lots of big fish with agressive feeding and stocking programs.
I've seen a lot, experimented a lot, and that combination allows for the best overall protection- large amounts of oxygen production from the surface agitator and great homogeneity/cirulation of the entire water volume with the bottom diffused system.
