1>filter sponge ,polyurethane foam materials 2>good aquarium filters 3>reticulated, open cell. any sizes,any shapes

filter sponge has different mesh(8ppi-60ppi), high resilient ,good colors and good air permeability .Widely used for aquarium filter, water pump, air filter and other filtering business .

It's durable in water and low cost .

PU foam, based for ceramic filter.

PU foam, widely used for filtering industrial .

filter sponge