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

In addition, the "Technical Policy for Ship Water Pollution Prevention and Control" addresses the issue of sewage, including black water and grey water. It emphasizes the gradual implementation of grey water control and recommends the use of appropriate devices for collecting and storing sewage on board. It also emphasizes the importance of closing drainage valves in areas where sewage discharge is prohibited, such as drinking water source protection zones, to prevent contamination of the surrounding water bodies. The policy further emphasizes the need for record-keeping of relevant control measures. However, it is important to note that this document serves as a guiding document and does not possess legal enforceability.