Eheim substratpro optimised bio-filter medium with perfect volume usage, long intervals between cleaning and top decomposition performance. substratpro consists of pearl-shaped sintered glass. The spherical shape gives a high bulk density. Thus the whole of the volume in the filter (filter baskets or modules) can be utilised. Also the optimum surface of the beads provides intensive colonisation of the important purification bacteria. due to the high number of bacteria, peak nitrite loads are more easily reduced and the maintenance intervals of the filter material are longer. eheim substratpro is suitable for fresh and marine water, is washable and can be reused. never clean or change all the filter media together in one operation (and never clean too rigorously). The bacteria cultures must not be completely destroyed, otherwise re-colonisation will be retarded. The filter baskets in the external filters and filter modules in the internal filters aquaball and biopower are ideal for partial cleaning.
