Purchased this after my 7 month old Keurig duo said to descale. Followed the directions yet it didn't descale my machine. Waited a couple weeks to see if the decale message would clear on its own and hadn't. Purchased 2 more bottles. Used them both today and I still have a descale message. I think I gave this product a fair chance to do what its meant to do. It was a giant waist of money for me but fingers crossed you have some luck with it.