Terms You Need To Know: PSI (pounds per square inch): This is force the water hits the surface with. The higher the PSI, the more stubborn stains, surface grime, dirt you can remove. GPM (gallons per minute): This is the amount of water that flows from the nozzle per minute. The higher the GPM, the bigger a job you can complete for a given PSI. CP (cleaning power): CP is PSI x GPM. It is a value that is representative of...
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