Started up in 2003, the kraft fiberline at Catawba is designed to produce 1500 tpd of bleached pine pulp for use in lightweight coated papers. Bowater/Catawba is the biggest LWC mill in North America. The fiberline features a large single-vessel hydraulic Lo-Solids digester followed by a pressure diffuser. Next, there's a two-stage oxygen delignification system (smaller and larger reactors in series), and finally a DEopDD bleach plant targeting 90% ISO brightness. Andritz DD washers are used from pre-O2 to the end of the bleach plant.