How to Choose a Coffee Machine For Pods The pod machines read 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). Simply insert it and then press a button. Inject an espresso pod https://wwwcoffeeeuk47608.blogsuperapp.com/28822982/3-common-reasons-why-your-best-pod-coffee-machine-isn-t-performing-and-how-to-fix-it