Ok I always assumed campden tablets where K - meta in tablet form. Went to my homebrew shop today and the guy there told me there sodium metabisulphate. Said they don't work the same. One is salt based one is potassium based. Is there really a difference. I bought the tablets as my recipe specifically calls for campden tablets and he got me worried K meta is not the same as campden. I like the idea of using powder (potassium meta as mines labeled) better as its easier to dissolve. I'm assuming by what this guy told me the campden tablets I bought are sodium based not potassium. From searches on the net he maybe correct but what's everyone's opinion on here.