> If I'm reading this study [0] right, it's about 10x more microplastics than rock salt, which makes sense if you think about it.

Yes, it does make sense, but that’s because micro plastics are everywhere we bother to look. In the air, in the water, in the fish, in animals, etc. However, that is no evidence that the micro plastics we get from salt are significant in any way compared to other sources, particularly considering how little of the stuff we actually eat. From an ecological point of view, getting it from the sea is much better than ripping mountains apart to extract it.

Even though I don’t care for micro plastics (e.g. I don’t look into it), I also buy (perfectly white) rock salt by chance. They dig it up 10 km from here, not on the Himalaya.

It looks like you are equating pink salt, and mined salt. Mined salt usually colored in white-gray spectrum.

Given the inorganic nature of sea salt, I believe it should be feasible to remove most microplastics from it, by applying intense heat briefly, in an oxygen atmosphere, so the microplastic particles would just burn away.