Hold on a sec - are we saying a Campden tablet of Sodium metabisulphite has or has not, the same SO2 abilities as an equivalent pill sized amount of Potassium metabisulphite?
I had heard there are 10 tablets to a level teaspoon. So if Sodium and Potassium were interchangeable, wouldn't that be 2.5 tablets= 1/4 teaspoon? Or are there differences between a British teaspoon and a US one?