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Ballast Water Treatment Systems (BWTS) Market to Reach a Valuation of ~US$ 8.9 Bn by 2027 In order to comply with the guidelines laid down by the IMO, companies in the ballast water treatment systems (BWTS) market are increasing R&D to innovate in UV systems. For instance, in May 2019, Purestream — a water service company, announced the launch of their advanced UV ballast water treatment system to offer operational advantages to vessel operators. This is evident, since UV irradiation is one of the key treatment methods in physical treatment.