Drip brewing methods need a filter to extract the right flavors. We recommend gold filters, which should be cleaned per the manufacturers' instructions. If you use a paper filter, we suggest an oxygen-processed type like BODUM®, which reduces the likelihood of flavors being trapped in the filter.
Far too often, we use finely ground coffees during brewing. This causes the steeping time of the grinds to increase and the beans to become over-extracted, resulting in a bitter taste. On the other hand, too coarse of a grind won't allow enough contact time, and a weak-tasting light colored extract will occur. A good extraction or steeping time for coffee is approximately four minutes. If you go over or under this amount by 30 seconds or more, reconsider your grind.