Descaler powder that takes into account the fine mechanics of advanced machines Retain the character of the coffee and increase the life of your coffee maker. Coffee makers, kettles and fully automatic coffee machines should descaling and cleaning approximately every 40 uses, depending on the hardness of the water. Melitta's descaling agents are adapted to the sensitivity of different machines and are available in tablet form, as powder and in liquid form. For the growing group of fully automatic coffee machines, there is a milder agent that takes into account the fine mechanics of advanced machines. Melitta descaling and cleaning agents work equally well for all makes.