Here's one thing we know: aeration is good for the soil. It opens things up and allows air, water and nutrients to penetrate deeper.
Here's another thing we know: 95% of homeowners cannot or will not rent a mechanical aeration machine. It's quite the hassle even to go and get it, especially if you don't have truck to get it home in. On top of that, it's quite the workout.
Now there is a much easier way to get the benefits: Liquid Aeration.
When you apply liquid Air-8 and water it in, it dives down into the soil breaking bonds between molecules which creates space. Every bond that is broken creates more space (aka greater soil surface area) where grass roots can then spread and grow.
This also pulls down moisture and carbon since humic acid is also included in the mix. If you have hard, compacted clay soil, Air8 liquid lawn aeration is an excellent alternative to the butt kicking you get from mechanical aeration.