The new innovative Tetra EasyCrystal Filter 250 is suitable for aquaria containing between 15 and 40 litres. 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 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: 250 l/h, for aquaria with 15 up to 40 litres content.