The HD 10/21-4 S is a 3-phase machine with a 4-pole, long-life water cooled motor, robust 3-piston axial pump with brass cylinder head and ceramic pistons, perfect for tough continuous daily applications. Ideal for daily cleaning of main deck, excellent choice for cargo holds cleaning, regardless cargo with its high water flow rate of up to 1,000 litres/hour and pressure of up to 210 bar. Can be used with salt water and fress water as well, like all High-pressure cleaners of Karcher.