I have used this in the past and have reordered several times.  It works faster and better than the vinegar-water mixture.  It takes less rinsing and leaves no odor or after taste.  It is a must for us!  We have hard well water and without this, our machines would have a calcium buildup and cease to work.  One bottle gives you a couple of cleanings, so it is reasonably price....much cheaper than replacing the coffee maker!