Establishing vegetation around the smelter site has been crucial in reducing lead dust movement with more than 250,000 trees, shrubs and saltbush planted to date. Recycled water which comes from the site’s sewerage plant is used to water the vegetation with the watering undertaken between 12.30am and 3am to minimise evaporation. Red gum trees have also been planted on-site after they were recognized as growing successfully around the city. Trials of a plant - Arundo donax – which is a fast growing giant reed, have also been undertaken. The giant reed is a perennial rhizomatous grass, which can grow up to eight metres tall and can reach a couple of metres in only a few months. As it forms thick stable clumps it has the ability to act as a windbreak, and is therefore is been planted near those areas of the plant that are susceptible to increased dust movement