Core Aerators create a healthy enviroment for lawns
Take a deep breath . . . Now breath DEEPER. Doesn't that feel good? This is a good analogy of what a core aerator can do for your lawn . . . It helps it breathe! These 3 point hitch or tow behind aerators actually remove a plug of dirt from your yard to reduce the compaction of the dirt and lets your seed, fertilizer, and water get to where it is needed.
Over time, weather works to compact the dirt underneath your lawn. Rain, sunshine, cold winter mornings and hot summer days constantly expand and contract and work your lawn into "hard pan". This is the same as trying to breathe through a sleeping bag for your grass.