Highly effective corrosion inhibitor and hardness stabilizer. The product effectively binds oxygen and removes scale. Contains an alkaline active substance based on environmentally friendly tannin ingredients with hardness-binding additives in aqueous solution. It forms a dynamic, non-inhibiting film of iron tannin that creates an effective corrosion protection on the metal. The product is physiologically and toxicologically safe. The main active ingredients of the product AquaCode® KCK 02 (6041 P) are pure extracts from natural products and are therefore biodegradable and environmentally neutral. The product is non-volatile - acceptable in the food industry.