ECA® (15-30 mm Rounds) media, with its highly porous structure, enables large microbial growth surfaces for biological filtration. Good storage capacity for biofilm and excellent permeability results in low-pressure loss and long service time which means reduced operational costs. The porous structure absorbs and holds water like a reservoir which eases water trickling. ECA® has sorption capacity towards H2S and other odors so the filter will start removing odor even before the biofilm is established