On November 30, 2018 Singapore’s Maritime and Port Authority (MPA) declared that, with immediate effect, the discharge of wash water from open-loop exhaust gas scrubbers in the port of Singapore would be prohibited.
The IMO’s global sulfur cap bans ships from using fuels with a sulfur content above 0.5% from January 1, 2020, compared with 3.5% now. To comply with the new rules, ships will be required to burn marine gasoil, low-sulfur fuel oil, or shift to alternative fuels like liquefied natural...
http://www.allaboutshipping.co.uk/2018/12/07/prohibition-of-open-loop-scrubber-systems-in-singapore/