be deemed approved. (5) Period of use of installed ballast water management system (A) In general Subject to subparagraph (B), an owner or operator shall be considered to be in compliance with the ballast water discharge standard if the ballast water management system installed on the commercial vessel complies with the ballast water discharge standard in effect at the time of installation, notwithstanding any revisions to the ballast water discharge standard occurring after the installation, so long as— (i) the owner or operator maintains the ballast water management system in proper working condition, as determined by the Secretary