Chinese Shipyard orders next generation ballast water treatment system by OceanSaver. Rongsheng Shipbuilding Heavy Industries, a large heavy industries shipbuilding group in China, has chosen Mark II, OceanSaver’s next generation ballast water treatment system, for two 317.000 dwt VLCC newbuildings. The contract comes just weeks after DNV type approval, certifying Mark II to fully meet the requirements of the International Ballast Water Convention, and previous system orders placed by Bohai Shipbuilding Heavy Industry (China) and SPP Shipyard (Korea) for two suezmax and four bulk vessels.