Filter coffee machines are very easy to use, and come in a wide range of cup volumes. They work by boiling water dripping slowly through a basket of ground coffee to infuse in a pot or carafe. Filter coffee machines usually use a thermos pots and hot plates to keep the coffee warm due to the longer brew time.
Filter coffee makers have either permanent metal/plastic or disposable paper holders. Permanent filters save you money in the long run as they do not need to be regularly replaced, but they will need to be cleaned after each days use, and can become tainted. Paper holders will need to have their filters replaced before every use, however are more hygienic and used filters can be easily thrown away after use.
Many new filter coffee makers use a ‘pod’ system. These pods are essentially foil-encased packets that act like a sort of coffee style tea bag. These filters can produce a range of cups of filtered coffee without making any mess, however the pods will need to be purchased specifically for each make of pod coffee maker.