A long flexible hose with a special drain cleaning nozzle attached to the end, is fed down the drain.
The nozzle emits very high pressure water jets, that blast away anything in front of it plus propels the hose down the drain.
Nozzles and hoses vary in design according to the size of the drain and the type of obstruction to be removed.
Effective on long distances, good for areas of limited access and can be used indoors without causing any disruption or mess.
Water jetters perform a much more thorough job on roots than drain machines and are excellent for removal of fats and grease as the water is heated due to friction.
Pressure cleaning of spillage areas cuts down on time of clean up.