Product details:

The various densities of Matala AquaMesh Pond Filter Media can be used in sequence or separately for unique filtration requirements. This is one of the greatest characteristics which Matala has to offer. 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 AquaMesh stacked horizontally will hold each other down. Due to it's rigidity, the Matala can be wedged in place in the filter without support. The Black AquaMesh pad has the least density followed by Green, Blue and Gray. Semi-rigid and self-supporting. Made of non-toxic Thermopoly Propylene. Black is approximately 1 7/8" thick. Green, Blue and White are approximately 1 1/2" thick.