The Kamwangi Factory (wet mill) is one out of three wet mills of the New Ngariama Cooperative Society in Kirinyaga in Central Kenya.
They are Rainforest Alliance certified, and have established soaking pits for waste water treatment. Kamwangi collects cherries from about 1000 smallholders with an average of 0,4 hectares of coffees, about 250 trees each. Fermentation is done with Fresh River Water. The same water is recycled during the day through a recycling process enabling them to significantly reduce water consumption.
The farmers under the New Ngariama Cooperative in Kirinyaga are located on the slopes of Mount Kenya and together with the neighbouring region Nyeri, the region is known for intense, complex, and flavour-dense coffees.
Cherries are hand sorted for unripes and overripes by the farmers before they go into production.
Pulping: A 3-Disc Agaarde pulping machine removes the skin and pulp. The coffees are graded by density into three grades by the pulper. Grade 1 and 2 go separately to fermentation. Grade 3 is considered low grade.
Fermentation: The coffee is dry fermented for 18-36 hours in concrete tanks under a roof that provides shade for better temperature control during fermentation.
Washing/Grading: After fermentation the coffees are washed and again graded by density in washing channels. They are sometimes soaked in clean water overnight.
Drying: Sun-dried 12 to 20 days on African drying beds. Time depends on weather conditions. Coffees are covered under plastic during midday and at night.