Potassium Chloride can be added in small quantities to brewing liquor to increase the chloride levels without increasing calcium or sodium as would be the case when using calcium chloride or sodium chloride (salt).
Potassium chloride is primarily used in brewing for a few specific purposes:
Adjusting Water Chemistry: Potassium chloride can be used to adjust the mineral content of brewing water. It adds potassium and chloride ions, which can contribute to the overall balance of ions in the brewing water, impacting the flavour profile of the beer.
Improving Flavour: The chloride ions from potassium chloride can enhance the mouthfeel and overall perception of sweetness in the beer, making it more rounded and smooth.
Yeast Nutrition: Potassium is an essential nutrient for yeast, and adding potassium chloride can help ensure that yeast has what it needs to thrive, especially during fermentation.
Salt Substitute: In some cases, potassium chloride may be used as a salt substitute for those looking to reduce sodium intake in their diets, while still adding a salty flavour to the beer.
When using potassium chloride, brewers typically need to be mindful of the overall mineral balance to avoid off flavours or undesirable characteristics in the final product.