Currently five verified types of biochemically active UgnCleanPellets® are available as hybrid filtering material. The biologically active UgnClean Pellets® form the basis for these filtering materials, which are suitable for the separation of high loads of hydrogen sulphide, VOC, ammonia, and odour emissions. In similar operating conditions, the material and operating costs are 50 % to 75 % below the costs of various types of activated carbon.