New granular materials for dual-media filtration of seawater: Pilot testing

A comparative assessment of data from dual-media filters tested in this as well as in previous campaigns with similar materials shows that the combination involving Filtralite NC 1.5-2.5 mm on top of Filtralite HC 0.8-1.6 mm exhibits, overall, the best performance. The latter is attributed to the rough surface texture of Filtralite grains, which are characterized by extensive crevices, with an increased capacity of retaining micro-particles and aggregates.