How to Choose a Coffee Machine For Pods The pod machines read the barcode on the top of the pod (which is actually an un-sealed disc of pre-dosed ground coffee compressed between two layers of filter paper). Simply insert it into the machine and push the button. Inject an espresso https://www-coffeee-uk03044.bloguerosa.com/27813081/11-methods-to-completely-defeat-your-pods-coffee-machine