Pond Matrixâ„¢ is a high porosity biomedia that provides efficient biofiltration for the removal of nitrogenous waste in ponds. Plastic bio-materials provide only external surface area, whereas Pond Matrixâ„¢ provides internal macroporous surface area. These macropores are ideally sized for the support of nitrifying and denitrifying bacteria. This allows Pond Matrixâ„¢, unlike other forms of biomedia, to remove nitrate along with ammonia and nitrite, simultaneously and in the same filter. Pond Matrixâ„¢ is completely inert and will not breakdown. It need not be replaced. It is also more suitable for use as a clean soil replacement for growing pond plants. Use 1â€“2 Liters of Pond Matrixâ„¢ for each 100 US gallons. Since the majority of the bacteria are internal, Pond Matrixâ„¢ may be rinsed when needed without damaging the filter. Pond Matrixâ„¢ is compatible with all types of wet or wet-dry filters.