siporax mini was specially designed for compact filters such as the new sera fil 60 or 120. This filter medium ensures best water quality by optimal biological purification. siporax mini is suitable for every compact internal biofilter, external filter, trickle filter systems in both fresh and saltwater aquariums. The filter medium is extremely economical: For example, 1 liter of sera siporax mini provides as much settling area for filter bacteria as 34 liters of ceramic filter material and ensures over 200 liters of crystal clear and biologically pure aquarium water.