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The Importance of a Coffee Filter Machine It is best to make sure you use clean, fresh water to achieve the best results. This lets the distinct flavors of coffee beans shine through. You can also save money over the long run by using a filter machine, since you just need to buy paper filters and coffee ground. You can also save money on cleaning costs and disposal. Filtered Water Many coffee and espresso machines come with their filter system. Others make use of reusable filters such as the most popular,