A high pressure sprayer removes joints of contaminant. To get a water pressure of at least 4,000 pounds per square inch, and at a rate above 5 gals / min is required. Pressure off the dirt and push off of joints without having to undo the pavement. The type of nozzle and the distance from the surface of the stone also influence the effectiveness of cleaning. The use of the pressure required to clean the joints should be left in our capable hands as it could leave marks on the pavement know that once sealed will remain forever. We can achieve the highest level of results in the least amount of time.