My wife is thrilled that our descaling coffee machines goes smoothly and is foolproof. The intervals between descaling have extended. We have very hard water and often have to descale. Usually, our devices report with vermindeter performance and a noticeable noise. With DURGOL we are much better satisfied than by vinegar or citric acid and the outrageously expensive decalcifiers the machine manufacturer. We have our remedies found five stars.