Most utilities use some form of flushing and disinfection of water mains in their regular maintenance schedule by opening a hydrant in the distribution system and flushing for an extended period of time to move water. The process is known as traditional flushing. Although lots of water is moved, this is not a very effective means for cleaning inside the water mains, as the water moves from multiple directions at a slower velocity.
UDF, on the other hand, involves the systematic closing of valves and opening of hydrants to create a single direction of flow in flushing sequences. All that water flowing in one direction results in faster velocity and more turbulent flow, which means cleaner water mains and a more efficient water system.
We flush from largest mains to smallest mains, and the cleanest mains to dirtier mains. This ensures dirty water is not being pushed into clean pipes and that the pressure stays high.