A Krups coffeemaker, like any other brand, needs to be cleaned occasionally. Over time, a residue from coffee oils can build up in the percolating unit and coffee carafe. This residue will leave a bitter taste in your coffee. "De-scaling" your Krups coffeemaker will remove the residue and provide you a better-tasting cup of coffee.
Unplug your Krups coffeemaker from the electrical socket. The machine and carafe should be cool to the touch before proceeding.
Wipe off the outside of the Krups coffeemaker with a damp sponge. Remove the filter holder and wash the permanent filter by hand with warm soapy water or wash it in the upper rack of your dishwasher.
Wash the carafe by hand with a sponge in warm water with a mild dish-washing liquid.
De-scale your Krups coffeemaker. Remove the filter holder and fill the carafe with a vinegar and water solution; pour the solution into the reservoir. Replace the carafe in the coffeemaker.
Plug in the coffeemaker and turn it on. The solution will run through the machine into the carafe. After the coffeemaker turns off, leave it for one hour. Repeat this procedure a second time.
Rinse the carafe with clear water. Fill it with water only and pour it into the reservoir. Replace the carafe and turn on the Krups coffeemaker so the water runs through it and clears out any of the vinegar solution. Repeat this procedure one more time.
Instead of using vinegar and water you can use citric acid or Krups descaling solution. Use one part water and one part citric acid or descaling solution.
Don’t use harsh detergents or abrasives on any part of the Krups coffeemaker.