According to IBIA, a full review of the 2015 Guidelines on Exhaust Gas Cleaning Systems (EGCS) needs more time, as only elements regarding malfunction of the EGCS system or a monitoring instrument have been sent for approval by the IMO’s Marine Environment Protection Committee (MEPC 74) in May. MEPC 74 will also discuss about ways to address any potential environmental impact of scrubber discharges to water.
IMO’s Sub-Committee on Pollution Prevention and Response (PPR 6) asked for an extension...
https://safety4sea.com/ibia-further-work-needed-to-update-imo-guidelines-for-scrubbers/