How to Choose a Coffee Machine For Pods Pod machines operate by reading the barcode 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 into the machine and push a button. https://www-coffeee-uk76523.p2blogs.com/27840332/the-top-reasons-people-succeed-in-the-pods-coffee-machine-industry