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The Importance of a Coffee Filter Machine It is recommended to use clean, fresh filtered water to get the best results. This allows the complex flavors of coffee beans shine through. You can also save money over the long-term with a filter machine, as you only need to purchase paper filters and coffee ground. You may also find you save money on disposal and cleaning costs. Filtered Water Many espresso and coffee machines come with their filter system. Some machines employ filter systems that are reusable, such as the Brita, which is a favorite