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The Importance of a Coffee Filter Machine For the best results you should use water that has been filtered that is clean and fresh. This lets the rich flavors of coffee beans shine through. A filter machine is more cost effective in the long run as you only need to buy ground coffee and paper filters. You could also save money on disposal and cleaning costs. Filtered Water Many coffee and espresso machines come with a filter system. Others make use of reusable filters such as the most popular, B