[This review was collected as part of a promotion.] My espresso machine started giving a weird taste to my coffee, but the Harris Descaler really helped fix that. I even tried with my Babybrezza machine and it worked great. It's extremely easy to use with clear instructions, and it noticeably improved my machine's performance and coffee taste after one cycle. I like use it at least once a month. After running the cycle you would have to repeat the rinse cycle in a total of 3 rinses with just water.
Also, disposal is straightforward: since it's vinegar-based, it can be safely poured down the sink with running water, which makes clean up hassle free.