HG Descaler is an effective descaling fluid which has been specially designed for the removal of scale from hot water apparatus such as: coffee-makers, washing machines & dish-washers. If allowed to build up, limescale & other deposits will make heater elements use more energy, meaning that it runs less efficiently & will wear out more quickly. Furthermore, in coffee- makers, scale does nothing to improve the taste of the coffee. The directions for use of HG Descaler vary with each heating appliance, & for thoroughly removing all traces of scale, the hardness of the water is a key factor. The correct application of HG Descaler is on the packaging.