Power, Pressure, and Flow–What You Need To Know

By July 19, 2017Blog, Latest News, Tips
pressure washers, Royce Industries

You’re probably familiar with the fact that water pressure is measured in PSI (pounds per square inch). PSI measures how much force pressure washers are able to produce in order to propel its water stream. However, contrary to popular belief, a pressure washers PSI rating is not the best indicator of its overall effectiveness. You must also consider the water flow, which is measured in GPM (gallons per minute). The GPM identifies the amount of water a pressure washer uses.

Total power for pressure washers are expressed in CPU (cleaning power units). CPU is the best indicator of a pressure washers overall performance. The relationship between PSI and GPM determines a pressure washer’s total cleaning power. To calculate a pressure washer’s total cleaning power, you just need to know a simple math formula:

PSI X GPM = Cleaning Power Units or CPU

This is an important equation to keep in mind when considering how much cleaning power you actually need.  Generally speaking, pressure washers with higher CPU ratings clean faster and more efficiently than smaller models. However, you don’t want to have too much power; a water stream that is too powerful could potentially damage the object you are trying to clean. Let our team at Royce Industries help you determine the right machine to get the job done in the most efficient way. Click here to have one of our experts answer all your questions.


Commercial Pressure Washers are the most efficient approach to any cleaning project. For those in the industrial and commercial sector, power washers are labor saving tools proven to save time and money. They conserve water by adding energy (pressure) to a reduced water flow from a garden hose, and use less of this very precious resource – H2O.


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