How to Choose a Coffee Machine For Pods Pod machines operate by reading the barcode at 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). It is easy to insert it and press a button. https://www-coffeee-uk48589.daneblogger.com/27934341/10-facts-about-best-pod-coffee-machine-that-insists-on-putting-you-in-good-mood