The World Rugby approval process exists to provide peace of mind to facilities that the product they are investing in is capable of meeting the requirements of Regulation 22. It is the manufacturer's responsibility to ensure that a product has been successfully laboratory tested. A World Rugby issued laboratory report proves that this testing has been undertaken for that product.
Field testing must be completed when a field is installed, before any rugby activity takes place on it, and at least every two years to ensure it continues to meet the requirements. A World Rugby issued field test report proves that this testing has been completed. A comprehensive maintenance regime and monitoring of its usage are critical in ensuring that the surface lasts and continues to meet the requirements in place.
It is worth noting that a Regulation 22 compliant field will also, likely, meet the requirements for FIFA certification.