The new innovative Tetra EasyCrystal Filter Box 300 is suitable for aquaria containing between 40 and 60 litres. An additional compartment enables an aquarium heater to be integrated into the filter. It is recommended to use the Tetra HT 50 heater (not included). With ist intensive mechanical, biological and chemical filtration, the filter ensures crystal clear, healthy water:Mechanical filtration: Double-layered Filter Floss Pads reliably remove even the tiniest particles. White side = coarse prefilter, green side = fine filterBiological filtration: Filter foam and filter balls with an extra large surface area for the growth of beneficial bacteriaChemical filtration: Special activated carbon to eliminate water clouding and unpleasant odours.It is extremely easy to clean the Tetra EasyCrystal Filter: simply replace the filter cartridge every 4 weeks. No need to rinse the filter medium, no more wet hands ! Technical data: power consumption: 230 V/50 HZ, 3.5 W, pump output: 300 l/h, for