The treatment principle of the Wartsila Aquarius EC BWMS consists of filtration with electrolysis during uptake and neutralization at discharge. This approval covers models with maximum treatment rated capacities between 250 m3/h and 4,000 m3/h.
Source: USCG
Link: 8/30/2018: Marine Safety Center issues Ballast Water Management System Type Approval Certificate to Wartsila Water Systems, Ltd.