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.
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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.