The Water Injected Lawn Aerator is just like the Lawn Turf Aerator with the connection of a garden hose. This aeration tool is equipped with a brass shut-off valve, which allows you to shut off water, preventing water wasting, saving you money on water bills. How to use: connect the hose to the Water Injected Lawn Aerator, turn the water on high, push the aerator's tips into the lawn with your foot until the footplate is rested on the soil. Leave the aerator in the soil until a bubbly pool begins rising to the surface. A soft ring of aerated water several feet in diameter should present itself. Repeat until all areas are aerated.