The BWMP shall be approved by the administration b. At the first IOPP renewal on or after 8 September at the latest, vessels shall meet the D-2 standard by having a ballast water treatment system BWTS approved, installed and commissioned. From the point of time where a vessel has to comply with D-2, the International Ballast Water Management Certificate will indicate the D-2 method only. But a BWM certificate is only required if the flag administration has their own national requirements. If the vessel does not have an IOPP certificate, then the compliance date is 8 September at the latest, if not otherwise given by the flag administration.