24 January 2015 The International Maritime Organization (IMO), in response to proposals by INTERTANKO and other industry advocates, has agreed to commence a review of the ballast water management system (BWMS) type approval guidelines. That’s nominally good news for the international ocean shipping community, whose collective group of 70,000 ships of all shapes and sizes will eventually have to invest as much as $US90 billion in new ballast water treatment systems once the IMO Ballast Water Management Convention enters into force….