Hydro-Excavation uses pressurized water to break up the soil and industrial vacuums to remove it. It is a environmentally-friendly method of safely digging. These trucks can be used for daylighting, potholing, trenching, and spills cleanups.
A dry substances vacuum truck, also known as an Air mover or a Dry super sucker works on the principle of pneumatic transport (air movement). The debris tank on the dry vac truck is placed under negative pressure by the large amount of air displacement created by the blower.
This is why dry vacuum trucks are also called air mover trucks.