Of all the things that build a healthy, thick lawn, Aeration is the most important. Tightly compacted soil restricts penetration of water, air, and nutrients to the roots.
The one thing most of us have in common in the Midwest, is clay based soil. Compacted soil is the primary reason that lawns thin out. Fragile grass roots do not have the power to push through heavy compacted, clay based soil, to keep the lawn thick and full. When the lawn becomes thin, weeds move in!
Aeration removes cores of soil and thatch allowing air, water, and nutrients to reach the roots while relieving soil compaction. By relieving soil compaction your roots are able to spreads into thin areas, thickening the lawn. The results are healthy, lush stands of grass, less weeds, and satisfied customers.