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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 to shine through. You can also save money over the long-term with a filter machine, since you only need to purchase paper filters and coffee ground. You could also save money on cleaning costs and disposal. Filtered Water Many coffee and espresso machines have their filtering system. Some use reusable filters, such a