The Green Matala filter media can follow thereby trapping a medium size particle. Both Green and Black Matala® filter media clean out very easily by simply shaking the pieces out before draining the sump. When you use the Black or Green Matala® for solids filtering you may use the garden hose to spray clean them. The dirt falls off very easily.
A good biofilter needs a lot of surface area with open spaces between for good aerated water flow. A high surface area is useless if the passageways are so small that water flow cannot penetrate.
The various densities can be used in sequence or separately for unique filtration requirements. This is one of the greatest characteristics which Matala filters have to offer. No other media on the market can perform this step-wise filtration. Matala filter media effectively separates large particles to small and still maintains a very aerobic and free flow of water without channeling.