Specifically, the work is being carried by vessels built in Chinese shipyards. The orders are about installations in a RoRo ferry, two RoPax, six tankers and four container vessels.

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Also, ship owners ask systems for the already existent vessels they have on their fleet, in order to be in line with IMO's Ballast Water Management Convention. As a result, owners are to install a BWMS following the special survey on vessel, after 9 September 2019.

This essentially gives a five year window for retrofits between September 2019 and September 2024, depending on when the special survey is due.

The Ballast Water Management Convention aims at preventing the spread of harmful aquatic organisms from one region to another, and at halting damage to the marine environment from ballast water discharge.

The Wärtsilä Aquarius UV (Ultra-Violet) BWMS has successfully completed all the required testing procedures and has been submitted for US Coastguard Type Approval.