All of the coffee grounds flow through the Kcup. EVERY TIME. I bought a box of 100 because I love McDonald’s coffee. It was a complete waste of money. After the fact I read tons of other comments on here saying the exact same thing. Who’d have thought I should have looked for reviews before buying a type of Kcup sponsored by Keurig. So disappointed. Terrible quality. That’s the Kcup’s whole job. To FILTER coffee.