The innovative EasyCrystal FilterPack 250/300 is suitable for both EasyCrystal Filter 250 and EasyCrystal FilterBox 300. With its intensive physical and biological filtration, the filter cartridge ensures crystal clear, healthy water. The double-layered Filter Floss Pads with a large surface area reliably remove even the tiniest particles. White side = coarse pre-filter, green side = fine filterFast, clean replacement: For best results change the filter cartridge every four weeks. No need to rinse the filter medium, no more wet hands! Important: The filter cartridge must be placed into the filter with the green side facing towards the front of the unit.