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The objective of this research was to determine the best operation conditions of an equipment designed to wash coffee whose mucilage is degraded by natural fermentation. It was used a 2 x 3 factorial design: two washed coffee flows (1,250 and 1,750 kg/h) and three water flows (3, 4 and 5 L/min), with 5 experimental units per treatment, each one of 100 kg of pulped coffee that remained 16 h in a fermentation tank. The best performance of the equipment is obtained with a washed coffee flow of 1,750 kg/h and a water flow of 5 L/min, obtaining a mucilage removal of 95.1%, a specific water consumption of 0.32 L/kg of dry parchment coffee, a mechanical damage of 0.51% and a specific power of 1.01 W.h/kg of washed coffee. The specific water consumption is reduced by 92.2% compared to the lowest value observed in the natural fermentation process. Fluids obtained with the washer can be dried up to a moisture content of 10 to 12% using solar dryers, obtaining organic fertilizer and controlling 100% of the pollution generated by the wet process.