Residential Pressure Washers

Pressure Washers - Outdoor Cleaning Projects Some terms you need to know (there are more at the end!) PSI (pounds per square inch) PSI is the water pressure. Its what gives you the power to penetrate and lift dirt, grime and various stains from the surface you are cleaning. Think of it in teams of how fast is the water coming out the nozzle. GPM (gallons per minute) GPM is the flow of water delivered to the surface area you are cleaning and is measured per minute. It flushes away the bad stuff. Think of it in terms of how much water is coming out the nozzle to cover a given area. Cleaning Units (PSI x GPM = CU) Cleaning units is what it’s all about. PSI and GPM combine to give you a true read on cleaning power. The more cleaning power you have the faster you will get the job completed.