How to Choose a Coffee Machine For Pods Pod machines work 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 press a button. https://coffeeeuk53749.dm-blog.com/28403519/10-tell-tale-symptoms-you-need-to-look-for-a-new-best-pod-coffee-machine