Worked as advertised
Really had a problem finding a reliable product, and let cleaning go until I couldn't stand the pot. Saw this and decided to give it a try. Put 4 doses in the thermos pot of my Bunn, filled with water and walked away for 30 mins. Did a really good job on the brown stains but still had black burned remnants on the bottom of the bowl. Repeated the process with 2 doses and enough hot water to cover the bottom.  Water was blackened but there was still deposit. A little steel wool work and rinsed out a spotless pot. Made a believer out of me. I now have a coffee pot cleaner to go to.
Rating: 5 stars