filter foam,used widely like air conditioner,aquarium pond,gutter filter,oil filter and so on.open cell,10ppi-90ppi This sponge filter is used in our hatchery and holding tanks.  The sponge cells provide an amazing amount of surface area to house nitrifying bacteria to help promote optimum water quality.  The coarse texture to the foam makes clogging of the filter unlikely. 

filter foam,aquarium foam,reticulated sponge,pond sponge