Aquapapa Bio Sponge Filter Cut-To-Fit Pad for Aquarium Fish Tank Koi Sump Reef 25&rdquo;x 4.75&rdquo;x 0.75&rdquo; Provides both mechanical and biochemical filtration Cuts to fit your filters Can be used again after cleaning up to 16 times Sponge size: 25" x 4 3/4"x 3/4"