title_body: Descaling Nespresso with citric acid
upvoted_answer: My opinion is that you can use citric acid. That's all that I use and I use it with my espresso machines, drip coffer maker, and I have used with Nespresso and Keurig machines. It is food safe. I buy it at my local beer and wine supply store. I have read to to use 12 - 18 grams of citric acid to a liter of water. I believe many descale solutions are made from citric acid. I use 3 1/2 teaspoons of citric acid to 40 oz of water to make my descaling solution. You can follow the manufacturers suggested routine of descaling.