The Kibirigwi Kiangai washing station was created in 1953, at the same time the group of farmers decided to establish the the Kibirigwi Farmers Coop Society. At this point in time the Kibirigwi Coop is affiliated Kyrinyaga County Coop Union and operates eight factories all together.
The water used for the processing comes from the Kibirigwi river, henge the name, which is 50m from the factory.
The cherries are sorted and floated before being pulped to separate any split, under and over ripe from the individual deliveries. The parchment is then fermented overnight, before being washed and graded into P1, P2, P3, P lights and pods. After the grading, it is dried on the drying tables for 8-14 days. The result is juicy coffee full of black currants and cherries in chocolate.