That is a good link by, Dr Luke. I agree with many of the posters, aeration is probably the best muck reducer. I previously owned an old cow pond that was literally quicksand. I spent an entire summer just pumping air and water into the muck and stirring it up like a dirty martini.

By fall I had cut the muck in half and had a backhoe dig out around the edge of the pond. The next summer I repeated the process and by fall, the pond was unrecognizable from what I started with.

As the Bob Marley song goes, Stir it up....