Fluval Foam Filter Blocks provide effective first-stage mechanical filtration for Fluval 404/405/406 model filters. These foam blocks are custom-fit to trap large particles and debris, with an ideal pore size to allow efficient water passage and prevent clogging.
Traps particles and debris for mechanical filtration
Pore size allows efficient water passage with less clogging
Safe for freshwater and marine aquariums
For Fluval 404/405/406 filters
The additional filter surface area provided by this foam also enhances biological filtration.
