aquarium filter sponge 1>Filter sponge,good Aqua filters 2>Reticulated ,open cell(10ppi---70ppi) 3>polyurethane foam materials, good for f

1.polyurethane foam material2,reticulated, mesh,10ppi-70ppi, could offer open cell and closed cell3 good resilient, good air permeability (95%) Tensi

1 pu foam material 2 reticulated, mesh,10ppi-60ppi, could offer open cell and closed cell 3 good resilient, good air permeability (95%) Tensile str