If someone wonders why to install a Ballast Water Treatment System, the answer is that it has to do with legislation; one comes from IMO and the other one from USCG. These two are the driving force for all of the suppliers to develop a system and for the shipowners to install a system at some point from today until 2016 and onwards. But before choosing a system, the available technologies have to be checked. I dare to say that nowadays the technologies are pretty mature and there are quite a few of them, so many choices exist for different shipowners, types of vessels and trading routes.
Officer of the Watch 