Garbage Disposal
Generally, discharge is restricted to food wastes, identified cargo residues, animal carcasses, and identified cleaning agents and additives in washwater which are not harmful to the marine environment. Garbage discharge regulations do not apply when the discharge of garbage from a ship was a necessary action for the purpose of securing the safety of a ship and those on board or saving life at sea.
When a ship is discharging chemicals agents from hold wash water to the sea and records such action to the Garbage Record Book then the ship should be able at any time to provide evidence that the cleaning agent or additive used was not harmful to the environment.