Start in this sub forum.
http://forums.pondboss.com/ubbthreads.php?ubb=postlist&Board=16&page=1
Quite a few success stories.

I had luck with adding ag lime and a yearly gypsum slurry.
Plus plants and predators to keep the crawfish and tadpoles to a managed level.

It still gets turbid in the winter but clears up nicely in summer.


Half acre 30 year old farm pond, Mebane NC. Aeration & feeder.
LMB, CC, SC, BG, HBC, two no account welfare carp and nine seasonal Tilapia that all the other fish are terrified of.