FILTRATION SPONGE FOR ASAP STANDARD 2PCS

They are made from carefully selected phenol plywood. They ensure effective mechanical filtration of water by capturing impurities and suspended matter that are visible to the naked eye. At the same time, they provide a substrate for the growth of nitrifying bacteria for biological filtration. For optimum performance, the spheres should be replaced regularly. Maintenance should only be carried out with aquarium water removed during water changes.