Descales automatically
You do not need to expend energy to descale the CM7500, it will do it automatically. The patented invention from Miele: The CM7500 descales itself from a cartridge at the back of the appliance. Every day, at a time of your choosing. This prevents stubborn scale build-up from forming in the first place. The cartridge lasts for about a year and is easy to replace. 
Features vary depending on model. Images for illustration purposes only.