The advanced filter media for today's serious pond enthusiast. One look at Matala® will convince you of its practical and versatile qualities. The open, highly aerobic 3 dimensional structure promotes healthy water conditions and ease of cleaning in most non-pressurized filter designs. Matala® is a filter media that is simple and that works. The various densities can be used in sequence or separately for unique filtration requirements. This is one of the greatest characteristics which Matala has to offer. No other media on the market can perform this step-wise filtration. Matala effectively separates large particles to small and still maintains a very aerobic and free flow of water without channeling. Matala is slightly buoyant and will not sink to the bottom of your filter. Matala stood vertically on end will not float. Matala stacked horizontally will hold each other down. Due to it's rigidity the Matala can be wedged in place in the filter without support. Long Lasting When dirty - Rinse and Reuse, Easy as that Easily cut to whatever size you need 8 sq. ft. equals 1 cubic ft of media Semi-rigid, self-supporting and non-brittle All sheets are 1.5" thick