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). It is easy to insert it and push a button. https://www-coffeee-uk49991.worldblogged.com/34169414/20-things-you-need-to-be-educated-about-pods-coffee-machine