18 gallons per minute will make short work of unclogging pipes to 18" diameter. As a general guideline begin cleaning the pipe from the lowest (downhill) side. This allows loosened debris to be flushed out. Keep in mind that the most common nozzles direct all or most of the water back in the direction of the hose and the operator. Do not begin operation until the hose has been pushed into the pipe a safe distance. Turns in the pipe may be easier to maneuver through after reducing pressure output. Cleaning the jet hose is done with the on board pressure washer wand/hose. Sometimes referred to as a hydro jetter or sewer pipe jetter, drain opener, drain pipe jetter or tow behind jet or tow behind jetter