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In wet method processing, the pulp is removed from the coffee cherry after  harvesting and the bean is dried with only the parchment skin left on.  There are  several actual steps involved. First, the freshly harvested cherries are passed  through a pulping machine where the skin and pulp is separated from the bean.  The pulp is washed away with water, usually to be dried and used as mulch. The  beans are separated by weight as they are conveyed through water channels, the  lighter beans floating to the top, while the heavier, ripe beans sink to the bottom.

Next they are passed through a series of rotating drums which separate them by size.

After separation, the beans are transported to large, water-filled fermentation tanks. Depending on a combination of factors *- such as the condition of the beans, the climate and the altitude *- they will remain in these tanks for anywhere from *2 to *8 hours. The purpose of this process is to remove the slick layer of mucilage (called the parenchyma) that is still attached to the parchment; while resting in the tanks, naturally occurring enzymes will cause this layer to dissolve. When fermentation is complete the beans will feel rough, rather than slick, to the touch.  At that precise moment, the beans are rinsed by being sent through additional water channels.  They are then ready for drying.