This Tariff Concession Order declares that specific programmable-logic-controlled decanter weirs for wastewater treatment (decanter weir boxes and floating scum booms) are goods to which Item 50 of Part III of Schedule 4 to the Customs Tariff Act 1995 applies. It took effect on 24 August 2007 and remains in force until revoked under sections 269SC or 269SD. Mechanically, the order changes the import tariff treatment for those listed items, affecting importers’ duty liability and requiring correct classification and supporting evidence to obtain the concession; it was issued by a delegate under section 269P.