What's Happening Inside Your Filter Coffee Maker? A filter coffee machine is a cheap, easy to use machine which makes filter ground coffee. It is operated by heating water in an aluminum tube & permitting it to flow over ground coffee. There are a variety of methods to filter coffee, https://coffeee-uk76929.blogdon.net/5-laws-that-will-help-those-in-drip-coffee-makers-industry-46623566