Tetra Easy Crystal filter pack 600C filter cartridge with active carbon. Ensures crystal-clear, healthy water with its intensive mechanical, biological and chemical filtering mechanism. Mechanical and biological filtering, the double-layer filter liner with its large surface area reliably removes even the smallest fine particles. White side coarse pre-filter and beige side soft fine filter. Chemical filtering, special active carbon for eliminating water colouration and unpleasant odours. Fast and clean replacement, no need to wash out the filter.