Potassium metabisulfite (KMS) is a versatile winemaking product that can be used for a variety of purposes, including:
 
Sanitizing equipment: KMS can be used to sanitize winemaking equipment, such as carboys, bottles, and hoses.
Preventing oxidation: KMS can be added to wine to prevent oxidation, which can cause wine to lose its flavor and aroma.
Killing wild yeast and bacteria: KMS can be used to kill wild yeast and bacteria in wine, which can help to prevent spoilage.
Promoting malolactic fermentation: KMS can be used to promote malolactic fermentation, a secondary fermentation that converts tart malic acid into softer lactic acid.
 
KMS is a safe and effective product that is widely used by winemakers. It is available in a variety of forms, including powder, granules, and tablets.