The flow-through method is a process wherein the replacement ballast water is pumped in at the bottom of
the ballasted tank, allowing for the water to flow through an overflow or other arrangements to achieve at
least a 95% volumetric exchange of ballast water. Pumping through three times the volume of each ballast
water tank is considered to meet the 95% volumetric exchange. In some cases, pumping through less than
three times the volume of the ballast tank may be acceptable, provided the vessel can demonstrate that at
least 95% volumetric exchange has been met.