1. The top pitch needs to roller. It appears that the expert hired to maintain the top pitch has recommended against grinding the field because it would lead to soil compaction and poor drainage. which means that grinding it could worsen the drainage issues and cause water pooling during rain. But if you insist you need to roller the top pitch.Please note that after grinding, the football pitch must be coring again. This would require additional coring process and incur significant expenses for equipment.(hundreds of thousands)2.Heavier roller? Normally the process grinds the field surface only. No need to go deep into the subsoil. Because the subsoil below is already dense. The problem occurs on the surface of the field (earthworms are the culprit). The compactor that can be operated in our school is this size (5 tons) 6,500 THB per day. If it is larger than this (10 tons) 8,500 THB per day. Using a larger roller (10 tons) is not feasible for our school due to size constraints and operational limitations.