Standard bio-filter medium with large colonization area for bacteria cultures and high efficiency SUBSTRAT can be layered in one or more layers. It is a highly porous filter material made from sintered glass. The surface structure offers the important purification bacteria excellent colonization conditions. The colonizable area amounts to 450 m
per litre. EHEIM SUBSTRAT is suitable for fresh and marine water, is washable and can be reused.
Tip: 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 aqua-ball an bio-power are ideal for partial cleaning.