Rotary nozzles spin an undeflected water jet in a circular path, so the water leaves the nozzle with greater speed. To produce a fan pattern, standard nozzles deflect the water on an angle, which slows the water down. When cleaning vertical surfaces, higher flow rates are not as critical because gravity helps contaminants flow from the surface.Ĭleaning speed also can be increased by using a rotary nozzle instead of a standard fan nozzle. Several contractors recommend a power washer with a volume output of 5 or 6 gpm. Heavily soiled concrete, requires higher flow rates. Once an adequate water pressure is established, flow rate determines the cleaning speed, especially how fast contaminants are flushed from the surface. Although higher pressures may be required to remove tough contaminants such as paint and heavy tire-skid marks, most power-washing contractors agree that 3000 psi will do the trick for almost all cleaning jobs. To clean concrete effectively, use a power washer with a pressure rating of at least 3000 psi and a flow rate of at least 4 gallons per minute (gpm). What PSI pressure washer do I need to clean concrete?
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