The descaler of WMF does his job as well as my other used Entkalker directly from the manufacturer of the coffee machine. The application is carried out just as usual: the descaler and water coming into the tank and the cleaning program starts. After looking at the water temperature efficient cleaning will have taken place. After cleaning, the machine is always clear how flushed and I can not detect any impairment of coffee taste. Therefore, I am fully satisfied with this descaler.