Why does my coffee have grounds in it?

Grounds in your cup are typically caused by buildup in the exit or entrance needles, which can be cleaned using a straightened paper clip. For optimal results, especially when transitioning from a coffee pod to a non-coffee pod such as tea or cocoa, clean both needles and perform 2 cleansing brews. Refer to the Exit Needle and Entrance Needle care instructions in the manual for detailed steps. (Page 5)

From the official Keurig K-Express Essentials Coffee Maker manual, page 5

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