Fluval Pre-Filter consists of inert, solid ceramic rings used to trap large and medium solid particles before they clog the finer sieves of the media baskets above. The media forces water into many complex paths as it moves thro...
BioMax filter media are inert ceramic rings that are capable of supporting large populations of water purifying bacteria. Composed of a variety of channels and tunnels, the multitude of tiny pores can support these colonies of ben...