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 coffee compressed between two layers of filter paper). Simply insert it into the machine and press the button. https://www-coffeee-uk51020.blogpostie.com/50598943/5-people-you-should-meet-in-the-pods-coffee-machine-industry