Cleartec® offers an attached growth media in the shape of a synthetic textile which is waste water resistant. The material is either Polypropylen (PP) – Biotextile or a combination of PP and Saran (PVdC) – BioCurlz. In order to keep the media in the system, the textile is fixed to e.g. a Stainless Steel module. Nevertheless the media is able to move due to the textile nature. The increased biomass produced by the curl-like textile enables biological wastewater treatment on a small surface area.