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The Importance of a Coffee Filter Machine You should use clean, fresh filtered water to achieve the best results. This allows the complex flavors of the coffee beans shine through. You can also save money over the long-term by using a filter machine, since you only have to purchase coffee grounds and paper filters. You could also save money on cleaning and disposal. Filtered Water Many espresso and coffee machines come with a filter system. Others make use of reusable filters like the one everyone loves