How to Choose a Coffee Machine For Pods Pod machines operate by reading the barcode on the top of the pod (which is actually a disc of sealed, pre-dosed ground beans that are encased between two layers of filter paper). Simply insert it into the machine and press the button. https://wwwcoffeeeuk73686.bloggazza.com/27838064/10-things-everyone-has-to-say-about-pods-coffee-machine-pods-coffee-machine