No matter the implement you use, aeration is essentially just putting holes in the soil to improve the flow of oxygen, water and other nutrients to the roots in the grass. Aeration actually causes initial damage to your yard, as it puts holes in the soil and may tear some roots, but in the long term it improves the overall health. Typically, an aerator is a tow- or walk-behind implement with lots of tubes (core-plugs) or spikes on it. As this is towed across the grass, the spikes pull out 1-3" cylinders of soil. These holes allow for the extra moisture and air to penetrate. Have BV Lawn Services Aerate Now!