Impact of water treatment management over production increase of caster n°4 of CSN Sueli A. Barros, Noraldo H.-G. Gomes, P. Sérgio S. Santiago and S. de O. Ribeiro Rev. Met. Paris, 105 7-8 (2008) 390-397 Published online: 25 July 2008 DOI: 10.1051/metal:2008056