The treatment principle of the Wärtsilä Aquarius UV BWMS consists of filtration with UV treatment at uptake and discharge. This approval covers models with maximum treatment rated capacities between 50 m3/h and 1,000 m3/h.

In addition, the USCG issued the 17th Coast Guard Ballast Water Management System type approval certificate to DESMI Ocean Guard A/S for its CompactClean BWMS.

In February, USCG had issued the 16th Coast Guard Ballast Water Management System type approval certificateto Envirocleanse LLC for its inTank ballast water treatment system (BWTS). Before that, during December, the US Coast Guard Marine Safety Center issued the 15th Coast Guard Ballast Water Management System type approval certificate to De Nora Balpure for its BALPURE® ballast water treatment system (BWTS). It also awarded the 14th approval certificate to Panasia Co., Ltd., for its GloEn-Patrol BWMS.

On 15 April 2019, the Coast Guard Marine Safety Center received its 24th application for Ballast Water Management System type approval for the EcoBallast Ballast Water Management System manufactured by Hyundai Heavy Industries Co., Ltd.

The 23rd application was received in February, for the HK-S(E) Ballast Water Management System manufactured by Japanese Miura Co., Ltd.

So far, Wärtsilä Water Systems, Ltd., DESMI Ocean Guard A/S (Denmark), Envirocleanse, LLC (USA), De Nora (USA), Panasia (Republic of Korea), JFE Engineering Corporation (Japan), Headway Technology (People's Republic of China), Alfa Naval (Sweden), Hyundai Heavy Industries (Korea), Wärtsilä Water Systems (England), BIO-UV Group (France), Samsung Heavy Industries Co (Republic of Korea), Techcross (Republic of Korea), Optimarin (Norway), TeamTec Ocean Saver (Norway), Sunrui (China), Ecochlor (USA) and Erma First (Greece) have won the USCG type approval.