Question: what is the difference between sodium metabisulfite and potassium metabisulfite?
Answer: The main difference between sodium metabisulfite and potassium metabisulfite is that one will leave residual amounts of sodium in the wine and the other will leave some potassium. ... Campden tablets are nothing more than potassium metabisulfite in tablet form. The tablets are measured in a dose for one gallon of wine.