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The Importance of a Coffee Filter Machine It is recommended to make sure you use clean, fresh water to achieve the best results. This lets the distinct flavors of the coffee beans shine through. You will also save money in the long term with a filter machine, as you only have to purchase paper filters and coffee ground. You could also save money on cleaning and disposal costs. Filtered Water Many coffee and espresso machines come with their filter system. Some machines employ reusable filter