Pressure Washer Psi. That power, or pressure output, is measured by pounds per square inch (PSI) and gallons per minute (GPM). The pressure put out by a power washer is measured in PSI (pounds per square inch), and the PSI requirements can vary based on what you're aiming to clean.
Many people note that they weren't expecting much from a budget model but were pleasantly surprised to see how well it performed for cleaning concrete, vinyl siding and patio furniture. Next, let's see how much psi pressure washer do I need for wood. An industrial grade triplex plunger pump.
Gallons Per Minute (GPM) Water flow is measured in GPM.
This pressure is more than a garden hose.
A pressure washer rated with a higher PSI and GPM will clean better and faster but often costs more than lower-rated units. An industrial grade triplex plunger pump. This is enough power to spray your face clean off so if you get one of these behemoths, exercise EXTREME caution.