What's Happening Inside Your Filter Coffee Maker? A filter coffee machine is a cheap and easy to use machine that produces filter ground coffee. It operates by heating water inside an aluminum tube & then allowing it to flow through ground coffee. There are a variety of methods to filter https://www-coffeee-uk60191.theideasblog.com/30907616/this-most-common-drip-coffee-makers-debate-could-be-as-black-and-white-as-you-might-think