You cannot pressure wash using a standard garden hose connected directly to house water spigots because regular municipal water pressure lacks the high-pressure pump force required. A standard garden hose typically delivers water at forty to sixty pounds per square inch (PSI) with a high flow rate, whereas a pressure washer utilizes an internal pump motor to amplify that pressure anywhere from fifteen hundred to four thousand PSI, creating the high-velocity stream needed to strip away stubborn outdoor grime.
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