Calgon 4in1 Power Gel protects the heating element, drum, hoses, and all important functional parts of your washing machine that come into contact with water from limescale, corrosion, dirt deposits, and odors. This keeps your machine clean and odor-free. For comprehensive protection against limescale and detergent residues, add the recommended amount of Calgon 4in1 Power Gel using the dosing cap to the detergent in the main wash compartment or directly into the drum. Dose the detergent as if for soft water (lowest dosage). This is better for the environment and saves you money.