Doesn't look like doing it in the forest is the best idea. From your link... > Ecological impact The amount of salt that goes to the region's soil and rivers

Doesn't look like doing it in the forest is the best idea. From your link... > Ecological impact The amount of salt that goes to the region's soil and rivers is enormous. The Werra river has become so salty (up to 2.5 g/L chloride ions, which is saltier than parts of the Baltic Sea) that few freshwater organisms can survive in it. The groundwater has become salty as well.[4] K+S are licensed to keep dumping salt at the facility until 2030.[3]