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

In addition, the "Technical Policy for Ship Water Pollution Prevention and Control" states that sewage, which includes both black water and grey water, should be addressed. The policy also emphasizes the gradual implementation of grey water control and the adoption of specific measures, such as collecting and storing sewage on board in designated devices and closing drainage valves in areas where sewage discharge is prohibited, such as drinking water source protection zones. These measures aim to prevent sewage from contaminating the surrounding water bodies. The policy further emphasizes the importance of maintaining records for the implementation of these control measures. However, it is important to note that this document serves as a guiding policy and lacks legal enforceability.