Rainman, I have suspended clay. It has been muddy since it was dug almost 2 years ago. I don't have any water coming into my pond, just rain water. I did the gal jug test with different amounts of gypsum and it worked. Doesn't Alum lower PH quite a bit? I want to do whatever works. How much Alum would I need for a pond my size if that is what I need? Thanks

1 1/4 acre L shaped pond, 6 to 9 ft deep. Finished 7/7/16. Stocked with LMB, HBG, BG, CNBG, RES, FHM. Can't wait to fish it. GO SAINTS!!!