oneTANK: The World’s Smallest Ballast Water Treatment System

  • Completion Date:
    July 2021
  • Collaborators:
    US Geological Survey
    Overseas Group (OSG)
  • Project Type:
    Technology Development
  • Service Categories:
    Marine Engineering
  • Challenge:
    Develop a ballast water treatment system for smaller vessels.


oneTANK is an innovative, small-scale ballast water treatment system (BWTS) that was developed through Glosten’s internal R&D program. After being approved for funding, it evolved from a concept into a fully built-out system, assembled at Glosten’s Seattle headquarters and distributed to operators around the world.

Based on a patented mixing technology developed by the US Geological Survey, oneTANK automatically treats seawater by applying and mixing the bulk chemicals in-tank, allowing users to treat on their own schedules, avoiding busy in-port times. The system is low cost and complies with the IMO Revised G8 Code and US Coast Guard standards and can be installed in larger vessels’ aftpeak tanks. It is also suitable for use aboard workboats, tugboats, semi-submersibles, fishing vessels, and superyachts. The technology was adopted by Overseas Shipholding Group’s tanker fleet and on the dredger M/V Charlock in the Netherlands.

oneTank front view_sm


ERMA FIRST, a global provider of environmental protection systems based in Greece, acquired oneTANK with the goal of bringing the world’s smallest and easiest to install ballast water treatment system to the international market. To date, oneTANK is one of Glosten’s greatest R&D success stories.

  • oneTank small