How to Choose a Coffee Machine For Pods Pod machines operate by reading the barcode on the top of the pod (which is actually an un-sealed disc of pre-dosed ground coffee that is pressed between two layers of filter paper). Simply insert it into the machine and push the button. https://coffeee58635.blogdigy.com/15-best-pinterest-boards-of-all-time-about-best-pod-coffee-machine-42311138