My Keurig started acting funny. Coffee was not as warm, it started to make louder noises during the brewing process and the coffee sizes were becoming less and less reliable (example: a tall travel sized portion was much less). The machine was acting up because it was clogged with scale. Easy solution: de-scale.
I've used vinegar in the past for all of my brewer descaling and it has worked satisfactorily. However, vinegar is not a product I keep around that often, it smells when it's used in a descaling situation and it takes up a lot of room if stored. That said, vinegar does work ... but I like these Cleancaf packets better.
Pros: they are small, easy to use, and this purchase gives you 9 uses.
Cons: is an irritant, may be more costly than vinegar
I believe a reviewer mentioned a "blue" color so that one could tell if the product was through the system adequately. For me, this was not the case. The color was cloudy white, not blue. But after several runs through my Keurig, it worked.
My method of use:
1) I have a Keurig B70 Single-cup K-cup brewer. I used a large Pyrex
Pyrex Prepware 1-Quart Measuring Cup, Clear with Red Measurements measuring cup to prepare the mixture and catch the mixture.
2) After I prepared the mix in warm water, I poured it into my Kuerig water reservoir and ran it through cup cycles (about 4 of them).
3) I thoroughly rinsed the water reservoir and used clean water to run through more cup cycles on the machine. Using my Pyrex, I could watch the water become clearer and clearer.
4) I ran 3 reservoirs of water through before I was satisfied it was clean enough and there were no traces of this product left. That worked.
After I was done, the coffee came out PIPING HOT at the set 129 degrees F. The portions were even and the machine was brewing much more quietly and efficiently. Descaling is not one of those things that one usually thinks about too often until a brewer starts to get moody. This is a great product to have on hand to take care of the brewer blues.
5 Stars!