请修正润色In addition the Technical Policy for Ship Water Pollution Prevention and Control point out the sewage including black water and grey water It also requires the gradual implementation of grey wate

In addition, the "Technical Policy for Ship Water Pollution Prevention and Control" highlights the importance of managing sewage, including both black water and grey water. It emphasizes the need for a phased approach to implement grey water control, which involves collecting and storing sewage on board using appropriate devices and ensuring that drainage valves are closed in water areas where sewage discharge is prohibited, such as zones designated for protecting drinking water sources. These measures are essential to prevent sewage from contaminating the surrounding water bodies. Additionally, the policy emphasizes the importance of maintaining records for all relevant control measures. However, it is important to note that this document serves as a guiding document and does not possess legal enforceability.