How to Choose a Coffee Machine For Pods Pod machines work by reading the barcode on the top of the pod (which is actually an un-sealed disc of pre-dosed ground beans that are encased between two layers of filter paper). Simply insert it into the machine and push the button. https://wwwcoffeeeuk79363.rimmablog.com/27968153/sage-advice-about-best-pod-coffee-machine-from-an-older-five-year-old