Typical high pressure power washers push 3-4 gallons per minute at 3500-4000 PSI. Widely available for purchase or rent, this type of machine works well on impervious surfaces such as concrete.

This is our trailer mounted 10/20 Alkota power washer with 200 gallon reserve tank. This machine pushes up to ten gallons per minute at 1500 PSI or less. It has a specialized gun which allows for the pressure to be adjusted up or down while cleaning. The reserve tank ensures adequate water supply. With 500 feet of high pressure hose, access is not an issue. This type of specialty equipment is not available at Home Depot.