Regulation 5 Category A residual mixtures—discharge
The discharge into the sea of a Category A residual mixture is prohibited except where all the following conditions are satisfied:
(a)
the effluent consists solely of water added to the tank after it has been emptied in accordance with regulation 4(3) or 4(5); and
(b)
the ship is proceeding at a speed of at least 7 knots in the case of a self-propelled ship or at least 4 knots in the case of a ship which is not self-propelled; and
(c)
the discharge is made below the water line; and
(d)
the discharge is made at a distance of not less than 12 nautical miles from the nearest land and in a depth of water of not less than 25 metres.