Abstract: A grain food product washing and hydrating system includes a mass-flow designed vessel. The vessel includes an upper wash section in the form of a cylinder. The wash section receives the grain food product and mixes the same with a fluidized liquid in a turbulent flow. Excess fluid is recycled. The washed grain food product then moves towards a frustoconical-shaped hydration section, where a treated liquid hydrates the grain food product. The shape of the hydration section allows for the mass-flow movement of the grain food product, which ensures continuous flow and enough residence time to hydrate the grain food product, before metering out the same for further processing.