what is a salt exchange system
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Dishwasher salt. ... In some countries, especially those in Europe, dishwashers include a built-in water softener that removes calcium and magnesium ions from the water. Dishwasher salt, which is coarse-grained sodium chloride (table salt), is used to regenerate the resin in the built-in ion-exchange system
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Back in the times of ancient history, there has been evidence of salt exchange system where the barter system of exchange was in use.
EXPLANATION:
Salt was very valuable in those times, and has been witnessed to be exchanged as the currency for trade. Even Roman soldiers were paid with salt as their salary wages.
The barter system identified salt as the most common and valuable matter of monetarily exchange in those ancient time and is a part of history over the globe.
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