This is the only descaler I will use. I recently bought a fancy and expensive coffee maker and it has all kinds of features. One feature automatically tells me when to descale. However, when I used the descaler sold by the same manufacturer, it didn't work. I tried the stuff three times. And I made sure I was using it correctly. But the little "descale" message wouldn't go away. After about three weeks, I decided to try a different product. So, I did some research and decided to try this Durgol stuff. It worked perfectly the first time, and it was a simpler process too. Plus, it wasn't the most expensive stuff out there. This is the descaler for my coffee machine forever. If you're looking for a coffee maker descaler that will work easily and safely, Durgol is good.This product is great! Use it for my Smeg coffee maker AND I got a bathroom cleaner of this product as well.Have used this product for years. Good product. Was easy to purchase and the seller had it shipped and delivered on time!This is the only descaling solution I use in my automatic espresso maker. This keeps machine working good.Bought to clean my coffee machine. Followed the instructions. Cleaned well. It served the purpose. Worth the price. Recommended.I bought my Tchibo coffee machine in December and was using it frequently when the descaler light came on. My friend recommended this product to use and loved it! It’s easy to use, works, and is convenient. The only complaint I have is that one bottle is one treatment, so if you use your machines a lot you’ll need to buy this more frequently. I’d recommend to run the water through a few times just to be sure there’s no residual product left.have used this product before and am very satisfied with the resultsI have a 10-year-old $35 Krups espresso maker. The tank was coated with 1/4 inch thick lime/calcification... I can only imagine what the inside pipes looked like. I was beginning to think the water wasn't spurting out as fast as it used to, so the espresso grind would be soaked too long and the bitter taste would go into the cup along with the delicious early drips.So I researched the decalcification options here on Amazon. didn't do outside research, though. Should I spend $13 on decalcifying, or buy a new espresso maker for $45? Tough. I opted to try decalcification. I was sold on using this liquid approach, as opposed to the cheaper powder, since my problem was so extreme. Hard water over 10 years builds up.I got two bottles with this package, and followed the instructions on the first exactly. Pour it in the tank, add 1 bottle-ful of water to the tank, and then run the espresso cycle. Then rinse a few times. It expressly said NOT to let the solution sit in the tank for any period of time. I noticed that some calcium deposits were left behind. What to do? I still had one more bottle to go, so I pour it in along with the water. This time I let it sit. (Elsewhere in the instructions, it said to leave the solution in items like glass coffeepots, until the bubbling stops.) So I waited till it didn't bubble any more - about 5-10 minutes. Then I ran the espresso maker cycle and rinsed again. This time, the tank was spotless! But...The downside was that the solution got rid of the huge build-up inside the tank, but I don't know about the bits of piping that lead the water out of the tank into the coffee grinds. I might have let the build-up go too long. Because what happened then was that small bits of the white calcification, about the size of grains of sand, were plugging up some of the tiny holes where the water pours out of the espresso-maker into the coffee grind. I have a feeling that the solution dissolved completely the lime/calcium in the tank, but didn't have enough time in the pipes to fully dissolve those deposits, so some were just dislodged or broken into smaller bits that plugged the holes. They weren't all plugged up, maybe only about 10%, but still. Maybe more would come. What to do? There is a screw on that metal sieve part in my espresso maker, but it was stuck and I only stripped it trying to remove it. So, I decided to just go ahead and use the machine anyway, and it seems to be working fine.Did the product improve the operation of my espresso maker after I used it? I can't honestly say I've noticed any difference. Certainly the product claims that calcification will affect the operation and efficiency of the espresso maker... I've made espresso from this machine almost every day for the last few years, so I have it down pat. It had at least 1/4 inch of scale, which was fully removed. You'd think I'd notice a difference, but I can't say that I did. Still, it certainly didn't harm anything, and so I'm sure it was good to do.So, in summary, I would say the product works completely great, but if you have a cheap espresso maker like mine, don't worry about all their cautions. Go ahead and let the solution sit in that tank, and then what I'd do is figure out a way for that solution to run all the way through the pipes and sit for a bit. The instructions caution against letting the solution touch the plastic or other parts of your espresso maker, but it did mine no harm. I wish I had just used the first bottle and let it sit for a long time, sloshing it around and letting the solution sit in all parts of the pipeline, before flushing. Then I'd have the second bottle for next time.Bottom line: it's expensive, but works.Definitely the best descaling liquid I've used. Works very quickly. No chemical smell. Once I've cleaned my coffee machine, i recycle it through my kettle. Definitely would recommend against any of the commercial descaling agents.Descaler Dolce gusto machine. No problems.Great job decaling our Nespresso and MoccamasterEasy to use and did the job well