Featuring the patented, supersonic nozzle, AirSpade is effective in virtually all soils and even hard clays. Under nominal conditions, AirSpade will dig a trench up to several inches deep per pass, in medium to stiff soil.
In general, AirSpade will not cut through rock. However, shale may be broken apart by the AirSpade if the air-jet is directed between the laminations of the rock. Typically, AirSpade will not dislodge hard, frozen soils which tend to behave like pavement or concrete.
Watering the work area ahead of time can sometimes be helpful. Water reduces soil strength thus making digging easier. Water also reduces airborne dust if the soil is extremely dry. Combining the use of the AirSpade with a low-pressure water source (garden hose) can aid the excavation of highly compacted or sun-baked soils.
