ESH FOAM BLOCK LG RS100-RS300

Large Foam Block Wet-Dry/Sump Filter Sponge Rectangle 4 x 2.25 x 13.5 InchesMechanical Filter Sponge for Zoo Med's 501 External Filter. Zoo Med's Mechanical Filter Sponge is the first line of defense in removing dirt and floating debris from your terrarium or aquarium. Grabs particulates; Removes debris.Mechanical Filter Sponge for Zoo Med's 501 External FilterGrabs particulatesRemoves debris.