How to Choose a Coffee Machine For Pods Pod machines operate by reading the barcode at the top of the pod (which is actually a sealed disc pre-dosed ground coffee that is pressed between two layers of filter paper). It is easy to insert it and then press the button. https://coffeee-uk97273.bligblogging.com/28875799/how-pods-coffee-machine-has-changed-the-history-of-pods-coffee-machine