By its mechanical filtration, biological and chemical intense, the filter ensures crystal EasyCrystal healthy water .. Mechanical and biological Filtration: the double-layered Filter Floss Pads with a large surface area reliably remove even the tiniest particles White side = coarse. pre-filter beige side = fine filter, no need to rinse filter medium, no more wet hands with Timestrip. Indicates when to change the filter cartridge .