Matala Pond Filter Media 22" Round x 6" thick- Blue The open, highly aerobic tri-dimensional structure of Matala Filter Media promotes healthy water conditions Ease of cleaning in in a wide variety of filter designs. 22 in. diameter x 6 in. thick. Mats are self-supporting, form-stable, rigid and non-brittle This is simply the most effective, longest lasting, crush resistant filter material available today!