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 coffee that is pressed between two layers of filter paper). Simply insert it into the machine and push the button. https://coffeee-uk87516.affiliatblogger.com/80621458/how-to-explain-best-pod-coffee-machine-to-your-grandparents