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1>actived carbon foam ,polyether foam ,reticulated&open cell., 2>good air permeability, 3>any size, any shape, any color - details see: https://www.machineto.com/actived-carbon-foam-10219704

actived carbon foam filter widely used in aquarium filtering, water filtering, air filtering, packing and other business .

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

It's durable in water and low cost .