On the border between the Nyeri and Kirinyaga coffee regions, Karii washing station provides services for 600 small farms, each with around 180 coffee trees. Most producers grow the SL-28 or SL-34 varieties, which are typical of Kenya. Farmers are using more and more shade trees to counteract climate change in the region. The washing station is run by the Mutira Farmer Cooperative Society, which has around 4,000 members. The farmers deliver the cherries to the washing station where they are sorted, weighed and then blended with other coffees of similar quality from the same day and finally processed. The Rundu River provides the water for processing - the skin and flesh of the coffee cherries are removed (washed and fermented), and then the beans are dried to about 12% and stored. Finally they are hulled, sorted and packed in the Dry Mill "Central Kenya Coffee Mills".