Some ponds never clear but around your area, it shouldn't be a problem. OK, it is a problem.
If the jar test didn't settle out you have positive and negative clay particles that keep repelling and bouncing off each other. That keeps them suspended. There's some technical wording involved but I can't find the specific reference that I want so I'll just leave it that.
The cheap way: Tear up a couple of bales of OLD erosion hay and toss it out in the pond. Yep, it looks terrible. It emits a very weak , I think, negative charge that causes 1/2 of the clay particles to stick to them. The others just fall to the bottom. The rest of the story? I've never tried it but the State Of Mississippi Aquatic Biologists recommend it. They say also that it doesn't work 100% of the time.
If that doesn't work, contact US Gypsum and ask their field scientists how much gyp to use and how to use it. I did it once and posted the results here but can't find the post. Maybe you can.
I have heard of mixed results with alum ranging from complete success to lowered Ph and resulting fish kills. I'm not going to give advice since I don't know enough about all of the factors involved.
Putting blue dye on mud is like putting lipstick on a pig. You still have no light penetration that the lowest end of the food chain, phytoplankton, needs to grow.
BTW, Lusk told me about a pond just outside of Fort Worth that they have used obscene amounts of gyp and alum on. Nothing has worked and he/they don't know why.
