The instructions for the descaler on the box indicate to follow the instructions on the descaler solution bottle. There are no instructions on the descaler solution bottle. I watched a video at Keurig.com and followed those instructions. It didn’t work - my descaler light still didn’t go off. I repeated the process with the 2nd bottle I had purchased, same result. I called Keurig support and found out that my K-Supreme requires the machine be put in “descaler mode” first. This required step was not on the Descaler box, descaler bottle or the descaler video. So, I wasted 2 bottles of the descaler solution.