[LazyPup]

The Calcium Chloride used in agricultural tractor tires is a salt-brine solution of calcium chloride and water. The purpose is to add traction weight to the tractor, which could be done just as easily with plain water, but you would then be confronted with the problem of the water freezing in winter. The inclusion of calcium chloride serves as an anti-freeze.

I would suggest you call your local agricultural tractor tire dealer to see if your community has any specific ordinances about disposing of the brine, but in most areas you can just discard it into a public sewer. (Do not discard it into a septic system)