To keep your steam cleaner in good condition, it is advisable to use Karcher Descaling Powder. All steam cleaners use water, and water contains lime. Unfortunately this is not good for the device and if you do not descale it regularly it will affect the cleaning result. With the descaling powder you keep your steam cleaner lime-free and you will enjoy it for longer. There are 6 powder bags in this set. This allows you to descale your device 6 times and to prevent lime-containing water from ending up on your kitchen counter when steaming. Did you not just clean everything for a reason?