This is an example of deep-tine aeration using solid pencil tines. This method of aeration produces minimal surface disruption to putting greens. Greens are completely playable immediately after application.
What: Aeration is a mechanical disruption to the surface/subsurface of the turf where the disruption creates an avenue for water and air to move freely.
Why: Like people, turf survives on oxygen. And as the name implies, aeration helps to circulate air and the absorption of water in the soil. Air and water are necessary to keeping turf healthy. Without aeration, greens would be soft, spongy and waterlogged all winter. (See before and after photos below)