Company Description Tandem Technologies is a leader in ballast water treatment technology. Founded in 1999, we are at the forefront of the international effort to combat the spread of biopollution and aquatic invasive species. Our company developed the Patented technology known as Medusa™ – a name well deserved for her ability to kill or render neutral every biological entity that crosses her path. We take great pride in developing technical innovations that merge advancements in process as well as design. We eliminate interference with normal operations to improve efficiency and effectiveness.