Zanyzap 12 Bio-Foam Pads For Fluval Fx4, Fx5, Fx6 Filters

12 bio-foam pads made for the Fluval FX4 FX5 and FX6 filtration systems. These bio foam pads provide outstanding mechanical and biological filtration thanks to an intricate pore structure that offers a large surface area. In addition they trap small particles that are not retained by the first stage of foam filtration.