DLR is researching a special biofilter system (combined regenerative organic-food production, CROP) for reducing organic waste. It will be used in the development of efficient life support systems. Its core element is a microbiological trickling filter of lava rock – the habitat of a multitude of micro-organisms, such as bacteria, fungi, and monocytes which purify and decontaminate water. In the system, water percolates through a filter tube filled with lava rock. The filter adjusts itself automatically to any incoming substances. The development aims at a wet composting system that may be used in closed environments such as, for instance, sewage pre-treatment, the improvement of nitrogen sources in agriculture, the microbial degradation of environmental toxins in industry, and other extreme environments such as crisis regions, contaminated areas, or outer space. Furthermore, CROP is a constituent element of ':envihab', a unique medical research facility where, from July 2013 onwards, DLR intends to investigate the impact of various environmental conditions on humans, and to explore possible countermeasures.