From The Maritime Executive. Published on February 14, 2016.

The U.S. Coast Guard’s December 14 decision to reject the most probable number (MPN) method for determining the efficacy of ballast water treatment systems has far reaching implications for equipment manufacturers and shipowners. Most recently, Trojan Marinex has submitted an appeal, and the Chamber of Shipping of America has issued a letter of support for the MPN method.

In January, ballast water treatment system manufacturer DESMI Ocean Guard also launched an appeal.

The MPN method evaluates the ability of an organism to reproduce and hence its ability to colonize a new environment. As such, it does not provide a result equivalent to that of the Coast Guard’s preferred method – vital staining