The treatment principle of the oneTank consists of in-tank chemical injection, with in-tank neutralization prior to discharge. This approval covers models with maximum treatment volumes up to 4,000 m3.

So far, Semb-Eco Pte, Ltd., Miura HK-(E)RHANLA IMS Co., Ltd., Miura Co., Ltd.Hyundai Heavy Industries Co.COSCO Shipbuilding Industry Co., LtdAlfa Laval Tumba ABWärtsilä 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 Laval (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), Erma First (Greece), Alfa Laval Tumba, Cathelco Ltd., Miura Co. Ltd., BAWAT A/S, NKBMS Co. Ltd, Techcross, Inc. and Kuraray Co., Ltd. have won the USCG type approval.

Here is a complete list of ballast water treatment systems approved or with type approval applications currently under review: