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The Importance of a Coffee Filter Machine It is recommended to use clean, fresh filtered water to achieve the best results. This allows the rich flavors of coffee beans to shine through. You will also save money in the long term with a filter machine, since you only need to purchase coffee grounds and paper filters. You could also save money on cleaning costs and disposal. Filtered Water Many coffee and espresso machines have a filter system. Some machines use filter systems that are reusable, such as