Fluval Foam Filter Blocks provide effective first-stage mechanical filtration for Fluval 204/205/206 and 304/305/306 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.
The additional filter surface area provided by this foam also enhances biological filtration.Dimensions: 2.74"L x 1"W x 8.5"H
