You probably need about a 1-2 tons, but you can't really put in too much. Ph with lime with cap at 8.5. When I have them do it again, I am going to have them put 2-3 tons along a shallow shelf that I have, the rest I will have them drive around the pond. Only about 1/3 of that goes in the pond. Then put what is left in the watershed.
GIve it 1-2 months, and see what happens. If it stays muddy after lime, then decide alum or gypsum.
Calcite or Calcium carbonate you can't screw up with. It is the most abundant element on the face of the earth and is the best addition to any home garden you can add. If pure calcium carbonate will buffer your PH to 7.2 and hold it there. This is the same with our pond water. Soluble calcium carbonate will buffer our pond water and keep it at 7.2 or try to.
Dolomite lime you can add too much because of how much magnesium it brings along for the ride. I am not a big fan of heavy metals.
Cheers Don.
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