PSI is the pounds per square inch. This is what delivers the punch during a power wash, forcing contaminants off the surface.
GPM is the gallons per minute. This flushes the contaminants pushed off by the PSI.
PSI is the pounds per square inch. This is what delivers the punch during a power wash, forcing contaminants off the surface.
GPM is the gallons per minute. This flushes the contaminants pushed off by the PSI.