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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 allows the complex flavor of coffee beans to shine through. A filter machine is more economical in the long run, since you only need to purchase filters made of paper and ground coffee. You could also save money on cleaning and disposal. Filtered Water Many espresso and coffee machines have their own filter system. Others make use of reusable filters like everyone's favorite, the Brita.