How to Choose a Coffee Machine For Pods Pod machines operate by reading the barcode that is 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). You just insert it and press a button. https://coffeeeuk47372.blogtov.com/8788995/3-common-causes-for-why-your-best-pod-coffee-machine-isn-t-working-and-solutions-to-resolve-it