epsom salt is magnesium sulphate and all the other salts you mention are sodium in one way or another. aside from adding the mineral magnesium and sulpher to soil in planting, it is used for a laxative, and bath salts. (a 50/50 mix of baking soda and epsom salt makes a great bath mix. add essential oils of choice for scent) i'm not sure it is actually a salt but it has crystals and looks and feels like salt.
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