Imports In 2007, Cook Islands imported $351 in Granulated slag (slag sand) from iron, steel industry, becoming the 0th largest importer of Granulated slag (slag sand) from iron, steel industry in the world. At the same year, Granulated slag (slag sand) from iron, steel industry was the 0th most imported product in Cook Islands. Cook Islands imports Granulated slag (slag sand) from iron, steel industry primarily from: N/A.