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In older times, the refining of salt from sea brine was poorly controlled. Hence, in The Bible "the salt has lost its savour". Seawater contains many salts, carbonates as well as chlorides, and many metal bases other than sodium, so it is necessary to partly evaporate the salt water, then decant off the liquid, and proceed with the remaining wet solid. Additionally, if the 'refined' salt were stored outside, then rain could remove the highly soluble NaCl and leave some of the (say) MgCO3 behind. So, as to the expression, the quality of the salt was a measure of its purity (/verity).
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Took it with a grain of salt?
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