How to Choose a Coffee Machine For Pods Pod machines work 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). Simply insert it and then press the button. https://www-coffeee-uk99962.bloggazzo.com/27893101/14-businesses-doing-an-amazing-job-at-best-pod-coffee-machine