You can use the Melitta Bio Descaler 250ml to descale your Melitta coffee machine in an environmentally friendly way. This liquid descaler contains citric acid, so it's biodegradable. By regularly descaling your coffee machine, you prevent the buildup of limescale in the pipes. You also extend the lifespan of the appliance and retain the taste of the coffee. This 250mm bottle provides you with enough descaling agent for 6 cleaning cycles. You have to descale a fully automatic espresso machine every month. Follow the manual before use to avoid misuse and the risk of serious eye damage.