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AgroSoil® is a product of FlyAshDirect, a Waste Management company. AgroSoil® is our branded variety of FGD gypsum, a synthetic by-product of fluidized gas desulfurization (FGD) at coal-fired power plants.

Current AgroSoil® Distribution Locations

Headquartered in Cincinnati, Ohio, we distribute AgroSoil® from three Midwestern power plants:


  • Zimmer Power Station in Moscow, Ohio
  • Miami Fort Generating Station in North Bend, Ohio
  • Cayuga Generating Station in Cayuga, Indiana

From these locations, we distribute AgroSoil® to agricultural customers throughout the Midwest.

How AgroSoil® Is Made

At coal-fired power plants, flue gases — including SO2 — are exposed to a slurry of hydrated lime. This turns the SO2 oxidation into calcium sulfite. The calcium sulfite is then oxidized to form gypsum. During the process, the by-product is washed with water to remove boron (B), mercury (Hg) and other undesirable chemical contaminants. Finally, centrifuges and vacuum filtration are used to remove excess water.

For more information, or to learn how you can order AgroSoil® for use on your farm,
contact us at (866) 871-9733.


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