The dependence of CDA lifetime on SA/V motivated the development of foamed CDA articles with increased SA/V and presumably shortened lifetime in the coastal ocean. We incubated a collection of CDA foams of varying densities in a flow-through seawater mesocosm and monitored their degradation over 36 weeks. Comparable PS foams were used as negative controls. These foams varied in thickness from 30 to 150 mil, in pore structure being either isolated or closed-cell, and in relative density (