Ag lime is available in two different forms around here. Standard lime is a tan color like sand, $25/ton and they call it 80/90. The high dollar stuff is gray and $45/ton, but I am not sure the true difference. Is it just the fineness of the grind? I've heard the term Hi Cal lime thrown around as well.
Which is more practical or desirable in a pond remediation situation?
I am guessing the 80/90 is mesh size. 80% will pass through a 90 mesh.
You want high Cal lime or Calcium Carbonate. You can't screw up with Calcium Carbonate. 99% of the time grey lime is dolomite lime and is high Magnesium. Magnesium can be toxic if in too high of a application.
The high the mesh the finer the product the more water soluble. The more soluble the less product you need for the same effect but the less product you have to stick around as a buffer to stabilize PH after applied. Calcium Carbonate is the best buffer in the world. It will bring PH up and will bring PH down. It naturally trys to bring the PH to 7.2. I would not use any other lime on any pond if I had a PH problem.
Cheers Don.
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