PSI stands for pounds per square inch. This in short is the pressure washers cleaning power. It is the force created by the pressure washing pump. The number of PSI marked on the equipment will tell you how much force the pressurized water comes out to. Although the PSI is important when getting your surfaces clean, we also want to see the GPM on the machine. GPM stands for gallons per minute. This tells us the volume of water that is coming through the pressure washing machine. The number of GPM will help in speeding up the cleaning and rinsing process leaving behind a clean finish. When picking out the correct pressure washer to buy or rent it is crucial to know what it will be used for. There are different catagories of pressure washing machines that break into residential and commercial grades both in gas and electric form.
For example if washing your car the light duty lower tier psi, electric grade set up is a great fit. A machine of this size can tackle car washing and other smaller infrequent projects such as grill cleaning, patio furniture and residential garbage bins. These pressure washers are in the 1,200 to 1.800 psi range and deliver 1.5 GPM of water volume. Up next we have 2,000 to 3,000 psi gas powered machines that are considered more heavy duty and shoot out around 2.8 GPM of water volume, these models are most common for residential scenarios such as driveways, sidewalks and pool patio surfaces. Lastly we have the 3,000 to 4,000 psi rated power washers that are commercial grade in nature and are to be used in large cleaning projects such as commercial plazas, banks, parking garages and other large concrete cleaning operations. These machines throw out 4-8 GPM of waterflow when paired with a buffer tank.
In conclusion we recommend you pick out the pressure washer and equipment needed to complete the task at hand with efficiency and quality in mind.
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