Thursday, June 22, 2006

Drip filter

The drip filter, either manual or automatic, is nowadays, together with the espresso and the Mediterreanean method, the most popular method of brewing coffee worldwide.

The drip filter system consists of two compartments, an upper and a lower one, divided by a filter.

Manual drip

In the manual drip filter the ground coffee is placed in the cylindrical or conical upper part and water (just off-boiling) is poured over it in steps. The brewed coffee drips through the metal, ceramic or plastic filter. The grind size of the coffee should be as fine as the holes in the filter allow. This means that the holes should not clog and no grounds should be in the coffee brew. Generally coarsely ground coffee is used in the cylindrical filter. In the conical filter, filter paper and finer ground coffee can be applied.

Electrical drip

The procedure can also be done by the numerous electrical drip filter machines that are available. The upper part is usually cone-shaped and contains a filter paper or a gold filter with very small holes. The water is near-boiling and sprayed over the coffee grounds. Because the holes in the filter system are smaller, the coffee can be ground finer. In the electrical machines there is generally also a device to keep the coffee warm, but keeping the brew on the heating plate too long is often detrimental to quality. Other factors which affect the quality are the contact time and the water/coffee ratio.

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