Sera Siporax mini was specially designed for small and compact filters. This filter medium ensures best water quality by optimal biological purification. Sera 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. One liter of Sera Sioprax mini has a effective area of 270 mfor settling bacteria. With filter net bag.