The SEAPORA Carbon Pad is a dense chemical filter pad designed to absorb dissolved organic matter, remnants of medications, and tannins from driftwood. It also facilitates the removal of particulates, odors, and discoloration from your aquarium system. SEAPORA Filter Pads can be cut & shaped to fit any filtration system, such as: Canister Filters, Hang-On Filters, Trickle Filters, Pond Filters, Wet/Dry Filters, Filter Cartridge Frames, and any other application where mechanical and chemical filtration is needed. Great for both freshwater and marine applications. 25.4W x 45.7H cm.10" x 18"