Potassium chloride is sometimes used for ice and snow removal on highways etc because it is thought to be less toxic to animals and plants than sodium chloride.|
Just like sodium chloride [table salt] in excessive amounts it can be lethal.
I've never used it "on purpose" but I suspect that many mineral blocks used for wildlife and livestock have potassium chloride in them.
Would be interesting to look at the labels on some of these blocks to see what the main ingredient is.
"It is not through knowledge, but through experience of the world that we are brought into relation with it."