Calc is indicating that it's time to descale the lime build up inside your coffee maker. Most machines are easily cleaned by running a solution of 4 parts water to 1 part vinegar. Run this solution through a regular coffee cycle (no coffee). After running this solution, you may want to run straight water once more to ensure there's no vinegar aftertaste. Your machine will now be clean and the CALC message should disappear. If not, post back with the Model # of your Krups coffee maker for further instructions. Some machines have a Descale or Self Cleaning option built into them.
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