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 a disc of sealed, pre-dosed ground coffee compressed between two layers of filter paper). It is easy to insert it and press a button. https://coffeeeuk86344.spintheblog.com/28678917/10-tell-tale-symptoms-you-need-to-look-for-a-new-best-pod-coffee-machine