What is the difference between Carrefour's "superior" salt and "high quality" salt?

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Taiwan Produces "Non-microplastic Contaminated" Salt

“More than 90 percent of salts sold across the world contain microplastics,… The study by the environmental scientists did not name specific brands, but just three sources of salt in their study did not include any microplastics: refined sea salt from Taiwan, refined rock salt from China and unrefined sea salt produced by solar evaporation in France.”