Citric acid is the compound most commonly used for descaling household appliances, including distillers. The citric acid is also used as an acidity regulator and antioxidant. By lowering the pH, it stabilizes all types of food. In addition, it helps in obtaining the desired color in eg. red wine.
CAUTION!
Every country has its own legal regulations governing the
manufacturing of ethyl alcohol, wine products, and spirits,
introducing them onto the market, and regarding sanctions for
non-compliance.