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 a disc of sealed, pre-dosed ground coffee compressed between two layers of filter paper). It is easy to insert it and push 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