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The Importance of a Coffee Filter Machine It is recommended to use clean, fresh and filtered water to get the best results. This lets the rich flavors of coffee beans shine through. You will also save money over the long-term with a filter machine, since you just have to purchase paper filters and coffee ground. You could also reduce the cost of cleaning and disposal. Filtered Water Many espresso and coffee machines have their own filter system. Others make use of reusable filters like everyone'