This Tariff Concession Order declares that specified seawater desalination pre‑treatment plants (piping, pumps, valves, tanks, chemical dosers, strainers/filters, electrical controllers) are goods to which Part III, Schedule 4 Item 50 of the Customs Tariff Act 1995 applies. It takes effect from 20 July 2009 and continues until revoked under sections 269SC or 269SD. The decision was made under section 269P of the Customs Act 1901 by a delegate of the Chief Executive Officer. Mechanically, it changes how customs treats imports of these goods (affecting tariff treatment and administrative compliance); importers carry classification and paperwork obligations while the Commonwealth administers the concession and may forgo tariff revenue.