Pressure Washer Correct PSI & GPM Combo: PSI rating isn’t the only spec to keep in mind when pressure washing, however, there is also the GPM rating (Gallons Per Minute). It is said in the pressure washing industry that the pressure (PSI) does the cleaning, but the water flow (GPM) cleans it faster. Pressure washer PSI and GPM work together to provide the most efficient cleaning. Getting the job done faster also means saving fuel, so not only can a good pressure washer save you time, it can also save you money.” To illustrate the importance of this concept, we have a spec known as CU (Cleaning Units). CU is simply a number derived from multiplying a machine’s PSI and GPM, but it is a representation of the amount of time a pressure washer will take to clean a surface.2 The higher the CU, the less time it will take to clean, and again, the more time you save, the more money you save. A 2,000 PSI rated machine that runs at 4 GPM will produce a CU of 8,000 (PSI X GPM = CU). Similarly, a 2,500 PSI rated machine that runs at 2 GPM will result in a CU of only 5,000. In this case, because it has a higher CU rating, the lower PSI machine will get the job done faster.
Pressure Washer Info – Benefit of proper PSI and GPM (Click to Open)