To keep your steam cleaner in good condition, it is wise to use Karcher descaling powder. All steam cleaners use water, and there is lime in water. Unfortunately, this is not good for the device and if you do not decalcify it regularly this affects the cleaning result. With the descaling powder you keep your steam cleaner free of lime and you enjoy it for longer. There are 3 bags of powder in this set. With this you decalcify your appliance 3 times and you prevent calcareous water from ending up on your countertop with steaming. Did not you just clean everything up for nothing.