Potassium & Sodium Metabisulfites- Which type of Campden Tablets (KMS, SMS) should I use and when?

The main difference between the sodium (SMS) and potassium (KMS) metabisulfites is the carrier element.

Their effects are virtually the same, with sodium metabisulfite being slightly more potent when it comes to contributing SO2 gas. Most home winemakers will use sodium metabisulfite as an equipment sanitizer as it is cheaper.

SMS = sanitizing

KMS = actual treatment of the wine