The main emphasis for this work is to open up the green surface to allow for water penetration as well as oxygen exchange.
4-4.5 inches depth for most of our greens puts the tine into the soil layer which rests below the sand. This will assist us with water moving further into the green profile allowing for better rooting in the sand layer. There will also be opportunities for roots to find an additional home in that small channel that was made by the tines. The more roots at great depth, the better chance of survival during the heat of summer.