Minimising the surface area and waterproofing it should reduce leaching. Sulfur isn’t ideal but it is used a lot in agriculture because it’s safer than many of the alternatives. For one thing, it is far better as lumps at ground level that as its dioxide in the atmosphere. I used to have to drive across Germany when acid rain was at its worst, km after km of dead trees. It was a pretty loud wake-up call and one of the reasons the Greens have been so strong in Germany. A lot of that was done by Communist-era burning of high sulfur lignite in the East.
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