Clean up 2x per week to backflush the zetgroepen with VIBIEMME Super Clean. More really is not necessary ! all other days only backflush water . Place the blind filter the piston. The blind filter you use to clean the brewing unit . Because the water can not flow , the hot water remains in the brewing unit , resulting in a cleansing effect . When you use filtering blind VIBIEMME Superclean what the coffee fats separate them in the infuser , after which it can be flushed out of the infuser through the back flush. Blind Filtering is called backflush .